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#1
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HELP! what's going wrong here?
In trying to apply paint to a 'sandy' type stucco finish:
Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter huge spotting, especially around cracking stucco. [done in 2008] So surface has essentially been primed. I asked the group and got a good recommendation for readily available Behr Masonry Stucco paint from Home Depot. The paint is thick, doesn't separate even days after shake mixing, and covers with one coat. I'm doing this myself, dont' want a lot of prep and mess and cleanup, so deemed to use a brush and just do sections at a time with any overlaps at corners/junctions, so won't show. I can do the painting in shade, in evening, so sun won't accelerate drying before curing. First problem is that it appeared that one gallon did around 80 sq ft !!! I tried cutting back, but can't even begin to get paint down into the 'holes' in the stucco. Have taken to poking at the wall with the bristles of the brush which almost works. Second problem is that the paint dries faster than I can move on. Meaning one can get a 'gummy' overlap between small sections as you move the ladder and scaffolding. Ok, I attributed that to very dry base surface. When done with this first coat, stood back and looked at it. Four days later, it still looked like I had used different colored paint sources, and the surface had a 'blotched' appearance. Looked like a quilt up on the wall consisting of square little 'islands' for the different sections I had done as I had moved along. Ok, first coat was a disaster so let's try it again. This time I added 2 oz of Floetrol to the half gallon of paint I was planning to use [recommended 4 oz per gallon]. Half gallon should do 80 sq ft on a second coat, right? WRONG! This time I moved as fast as possible. Set the ladder start at the top and come down to the stone facade as fast as possible, then move over and repeat until done. As I worked I completely filled EVERY hole I could see and verified that the surface had a nice wet sheen everywhere. This time I was moving so fast that even the overlaps were successful - they still had their wet sheen into the previously painted areas. I can live with using excessive paint [this is NOT color coverage, but liquid coverage] But I cannot live with the end result: As you stand and look at the wall you see very obviously well defined 'strips' down the wall. All the same color, but looks like sheets of wallpaper overlapping at their edges around 4 inches! It's been over 24 hours now with time to properly cure and dry and even the sun has hit the wall now, yet the effect is still there! I can't paint my house and have these ugly patterns left all over it when I'm done. What am I doing wrong here? Again spray paint is not an option [I have a $2,000 airless sprayer in storage I don't have access to since I own one I'm not allowed to buy another one]; rollers might be an option but the cleanup after doing each section will be monumental, plus not sure the roller can get paint down into all the nooks and crannies anyway. So, a brush is the most convenient way that I'd like to stay with. So, why has this turned into a fiasco? Why can't these walls be painted with a brush? What am I doing wrong here? |
#2
Posted to alt.home.repair
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HELP! what's going wrong here?
On Nov 1, 9:10*am, Robert Macy wrote:
In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter huge spotting, especially around cracking stucco. [done in 2008] So surface has essentially been primed. I asked the group and got a good recommendation for readily available Behr Masonry Stucco paint from Home Depot. *The paint is thick, doesn't separate even days after shake mixing, and covers with one coat. I'm doing this myself, dont' want a lot of prep and mess and cleanup, so deemed to use a brush and just do sections at a time with any overlaps at corners/junctions, so won't show. I can do the painting in shade, in evening, so sun won't accelerate drying before curing. First problem is that it appeared that one gallon did around 80 sq ft !!! *I tried cutting back, but can't even begin to get paint down into the 'holes' in the stucco. Have taken to poking at the wall with the bristles of the brush which almost works. Second problem is that the paint dries faster than I can move on. Meaning one can get a 'gummy' overlap between small sections as you move the ladder and scaffolding. *Ok, I attributed that to very dry base surface. When done with this first coat, stood back and looked at it. Four days later, it still looked like I had used different colored paint sources, and the surface had a 'blotched' appearance. Looked like a quilt up on the wall consisting of square little 'islands' for the different sections I had done as I had moved along. Ok, first coat was a disaster so let's try it again. This time I added 2 oz of Floetrol to the half gallon of paint I was planning to use [recommended 4 oz per gallon]. *Half gallon should do 80 sq ft on a second coat, right? WRONG! *This time I moved as fast as possible. Set the ladder start at the top and come down to the stone facade as fast as possible, then move over and repeat until done. *As I worked I completely filled EVERY hole I could see and verified that the surface had a nice wet sheen everywhere. This time I was moving so fast that even the overlaps were successful - they still had their wet sheen into the previously painted areas. I can live with using excessive paint [this is NOT color coverage, but liquid coverage] But I cannot live with the end result: As you stand and look at the wall you see very obviously well defined 'strips' down the wall. All the same color, but looks like sheets of wallpaper overlapping at their edges around 4 inches! It's been over 24 hours now with time to properly cure and dry and even the sun has hit the wall now, yet the effect is still there! I can't paint my house and have these ugly patterns left all over it when I'm done. What am I doing wrong here? Again spray paint is not an option [I have a $2,000 airless sprayer in storage I don't have access to since I own one I'm not allowed to buy another one]; rollers might be an option but the *cleanup after doing each section will be monumental, plus not sure the roller can get paint down into all the nooks and crannies anyway. So, a brush is the most convenient way that I'd like to stay with. So, why has this turned into a fiasco? Why can't these walls be painted with a brush? What am I doing wrong here? Have you thought of spraying the walls with a hose before you paint to have a damp base? |
#3
Posted to alt.home.repair
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HELP! what's going wrong here?
RENT a paint sprayer......
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#4
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HELP! what's going wrong here? (bonehead subject line)
Robert Macy wrote:
- HELP! what's going wrong here? - Sorry - I don't know what's going on here. You weren't more specific in your subject line, so I can't help you. But congratulations. You win today's "Bonehead Subject Line of the Day" award! |
#5
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HELP! what's going wrong here?
On Nov 1, 10:10*am, Robert Macy wrote:
In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter So surface has essentially been primed. Ha! So, why has this turned into a fiasco? You don't know what you're doing. Why can't these walls be painted with a brush? Dirt, probably, but paint does not flow into cracks, crevices and holes the way one might imagine, you have to force it in by back- brushing even if you spray it. What am I doing wrong here? Operating too far beyond your area of expertise. ----- - gpsman |
#6
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HELP! what's going wrong here?
On Nov 1, 7:33*am, bob haller wrote:
RENT a paint sprayer...... sigh, don't want to do it ALL on one day, want to just do it leisurely. And from my experience with my sprayer, prep is incredible and drift and overspray and ... Got a lot of glass, frame and structures to contend with. Only single story 4,000 sq foot home, with lots of architectural features, so there are lots of 'break' points |
#7
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HELP! what's going wrong here?
On Nov 1, 7:22*am, "hr(bob) "
wrote: ...snip... Have you thought of spraying the walls with a hose before you paint to have a damp base? kind of. I did think to scrub off the wall first and got a lot of coloration coming off on the lower area of the walls. When I told Paint people about the problem, they talked about making certain the wall were clean AND dry. |
#8
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HELP! what's going wrong here?
On Thu, 1 Nov 2012 07:10:30 -0700 (PDT), Robert Macy
wrote: So, a brush is the most convenient way that I'd like to stay with. So, why has this turned into a fiasco? Why can't these walls be painted with a brush? What am I doing wrong here? Get some thick nap roller covers (1/2-3/4 inch) and roll the paint on. I'd still like to see a photo of your stucco texture. Is it really a sand finish or a light knock-down texture? Are you following the paint can label for proper temperatures? |
#9
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HELP! what's going wrong here?
On Nov 1, 8:02*am, gpsman wrote:
On Nov 1, 10:10*am, Robert Macy wrote: In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter So surface has essentially been primed. Ha! So, why has this turned into a fiasco? You don't know what you're doing. Why can't these walls be painted with a brush? Dirt, probably, but paint does not flow into cracks, crevices and holes the way one might imagine, you have to force it in by back- brushing even if you spray it. What am I doing wrong here? Operating too far beyond your area of expertise. *----- - gpsman Operating too far beyond my expertise? By definition of results, true. But, I know enough to ask. I do have experience, and have experience in learning HOW to do. I used to work for a professional home painter and learned all kinds of tricks and tips, most people don't know about. To do the exterior of our 5,000 square foot two story Edwardian house I purchased an expensive paint sprayer . Had to prep that extensively, since it had been allowed to deteriorate over the years before we got to it. One side took 16 hours just to spray coat. Completely rebuilt the interior putting it back to original as much as possible. Worked with techniques and self taught to the extent that the local museum curator had his restoration people come talk to me to see my workmanship and find out how to do things the 'original' way for restoring their buildings. [the house was built in 1906 using materials that boggle your mind, like REAL 2 by 4's actually 2 by 4 in size, and hand sawn wood timbers and planking.] One example, I showed them how to brush paint yet obtain a surface as smooth as formica and always better than spray painting. However, I did get close to that flatness by using an artist's airbrush with variable spray pattern to do the 80+ frames in the french doors..Beat 'hand cramp' any day. The idea of dirt I considered first, so I scrubbed the wall section the day before, but to no real improvement to the symptoms of my problem. Plus, the problem that prompted me to post here today has just occurred over a new layer of paint unlikely to have been caused by dirt. As far as nooks and crannies go, I kind of thought that if the brush can't fill that then a roller would fare no better. Even spray painting will have its ability challenged to fill well. |
#10
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HELP! what's going wrong here? (bonehead subject line)
On Nov 1, 7:53*am, Home Guy wrote:
Robert Macy wrote: *- *HELP! what's going wrong here? *- Sorry - I don't know what's going on here. You weren't more specific in your subject line, so I can't help you. But congratulations. You win today's "Bonehead Subject Line of the Day" award! Wow! I didn't know there was a competition in that category. I'll try to be MORE obtuse next time to maintain my award status. |
#11
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HELP! what's going wrong here? (bonehead subject line)
On Nov 1, 1:24*pm, Robert Macy wrote:
On Nov 1, 7:53*am, Home Guy wrote: Robert Macy wrote: *- *HELP! what's going wrong here? *- Sorry - I don't know what's going on here. You weren't more specific in your subject line, so I can't help you. But congratulations. You win today's "Bonehead Subject Line of the Day" award! Wow! I didn't know there was a competition in that category. I'll try to be MORE obtuse next time to maintain my award status. LOL |
#12
Posted to alt.home.repair
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HELP! what's going wrong here?
On Nov 1, 9:10*am, Robert Macy wrote:
In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter huge spotting, especially around cracking stucco. [done in 2008] So surface has essentially been primed. I asked the group and got a good recommendation for readily available Behr Masonry Stucco paint from Home Depot. *The paint is thick, doesn't separate even days after shake mixing, and covers with one coat. I'm doing this myself, dont' want a lot of prep and mess and cleanup, so deemed to use a brush and just do sections at a time with any overlaps at corners/junctions, so won't show. I can do the painting in shade, in evening, so sun won't accelerate drying before curing. First problem is that it appeared that one gallon did around 80 sq ft !!! *I tried cutting back, but can't even begin to get paint down into the 'holes' in the stucco. Have taken to poking at the wall with the bristles of the brush which almost works. Second problem is that the paint dries faster than I can move on. Meaning one can get a 'gummy' overlap between small sections as you move the ladder and scaffolding. *Ok, I attributed that to very dry base surface. When done with this first coat, stood back and looked at it. Four days later, it still looked like I had used different colored paint sources, and the surface had a 'blotched' appearance. Looked like a quilt up on the wall consisting of square little 'islands' for the different sections I had done as I had moved along. Ok, first coat was a disaster so let's try it again. This time I added 2 oz of Floetrol to the half gallon of paint I was planning to use [recommended 4 oz per gallon]. *Half gallon should do 80 sq ft on a second coat, right? WRONG! *This time I moved as fast as possible. Set the ladder start at the top and come down to the stone facade as fast as possible, then move over and repeat until done. *As I worked I completely filled EVERY hole I could see and verified that the surface had a nice wet sheen everywhere. This time I was moving so fast that even the overlaps were successful - they still had their wet sheen into the previously painted areas. I can live with using excessive paint [this is NOT color coverage, but liquid coverage] But I cannot live with the end result: As you stand and look at the wall you see very obviously well defined 'strips' down the wall. All the same color, but looks like sheets of wallpaper overlapping at their edges around 4 inches! It's been over 24 hours now with time to properly cure and dry and even the sun has hit the wall now, yet the effect is still there! I can't paint my house and have these ugly patterns left all over it when I'm done. What am I doing wrong here? Again spray paint is not an option [I have a $2,000 airless sprayer in storage I don't have access to since I own one I'm not allowed to buy another one]; rollers might be an option but the *cleanup after doing each section will be monumental, plus not sure the roller can get paint down into all the nooks and crannies anyway. So, a brush is the most convenient way that I'd like to stay with. So, why has this turned into a fiasco? Why can't these walls be painted with a brush? What am I doing wrong here? Are you sure the paint is fully dry? If it went on as thick as you said, there may be dampness under what appears to be a dry surface, and that dampness would be where there is an overlap and the paint is the thickest. |
#13
Posted to alt.home.repair
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HELP! what's going wrong here?
Robert Macy wrote:
On Nov 1, 8:02 am, gpsman wrote: On Nov 1, 10:10 am, Robert Macy wrote: In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter So surface has essentially been primed. Ha! So, why has this turned into a fiasco? You don't know what you're doing. Why can't these walls be painted with a brush? Dirt, probably, but paint does not flow into cracks, crevices and holes the way one might imagine, you have to force it in by back- brushing even if you spray it. What am I doing wrong here? Operating too far beyond your area of expertise. ----- - gpsman Operating too far beyond my expertise? By definition of results, true. But, I know enough to ask. I do have experience, and have experience in learning HOW to do. I used to work for a professional home painter and learned all kinds of tricks and tips, most people don't know about. To do the exterior of our 5,000 square foot two story Edwardian house I purchased an expensive paint sprayer . Had to prep that extensively, since it had been allowed to deteriorate over the years before we got to it. One side took 16 hours just to spray coat. Completely rebuilt the interior putting it back to original as much as possible. Worked with techniques and self taught to the extent that the local museum curator had his restoration people come talk to me to see my workmanship and find out how to do things the 'original' way for restoring their buildings. [the house was built in 1906 using materials that boggle your mind, like REAL 2 by 4's actually 2 by 4 in size, and hand sawn wood timbers and planking.] One example, I showed them how to brush paint yet obtain a surface as smooth as formica and always better than spray painting. However, I did get close to that flatness by using an artist's airbrush with variable spray pattern to do the 80+ frames in the french doors..Beat 'hand cramp' any day. The idea of dirt I considered first, so I scrubbed the wall section the day before, but to no real improvement to the symptoms of my problem. Plus, the problem that prompted me to post here today has just occurred over a new layer of paint unlikely to have been caused by dirt. As far as nooks and crannies go, I kind of thought that if the brush can't fill that then a roller would fare no better. Even spray painting will have its ability challenged to fill well. I would have wet it and noticed how water flowed and stuck. Wondering about waterproofing ? I brushed half my cinderblock with same paint. No noticeable color changes. Slap paint on, then tap into holes. I did stir the paint. Greg |
#14
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HELP! what's going wrong here?
On Nov 1, 11:46*am, "hr(bob) "
wrote: ...snip... Are you sure the paint is fully dry? *If it went on as thick as you said, there may be dampness under what appears to be a dry surface, and that dampness would be where there is an overlap and the paint is the thickest. Good point! I am watching to see if the effect is mitigating over time. I fear that what I am seeing is a subtle effect of slightly smoothing an otherwise rough coating and THAT simply shows up as a shiny line about 4 inches wide of vertical strips down the wall. When the sun is on the wall the lines are very pronounced, when the wall is completely shaded, not so much, but still discernible. I have absolutely NO idea how to solve this other than bite the bullet and spray the ****** out of it. |
#15
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HELP! what's going wrong here?
On Nov 1, 6:06*pm, gregz wrote:
...snip... I would have wet it and noticed how water flowed and stuck. Wondering about waterproofing ? I brushed half my cinderblock with same paint. No noticeable color changes. Slap paint on, then tap into holes. I did stir the paint. Greg I will try that on the first coat areas. but the problem that prompted me to post today was from watching stripes appear on the coat over a fairly solid first coat. When I called back to HD, the Home Depot paint people asked me if the wall was clean 'and' dry. However, Ms Macy suggested, as you did, scrub the dirt and powdered old finish off the wall and then wet the wall before you paint it. I'm going to try more Floetrol AND wet the old surface first. |
#16
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HELP! what's going wrong here?
In article
, Robert Macy wrote: I have absolutely NO idea how to solve this other than bite the bullet and spray the ****** out of it. I've been waiting for the stucco experts to come out and tell you that you aren't supposed to paint stucco. |
#17
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First problem was that he was only getting 80 square feet of coverage per gallon. I expect that's because the surface of your stucco is porous, and so the moisture in the elastomeric coating is BOTH being wicked into the stucco and evaporating into the air. So, it's drying considerably faster than it would if it were being brushed onto a non-porous substrate.
It would have been better to prime the stucco first to prevent the water from the elastomeric coating from being sucked into the stucco. Or, at least, that's what I think is going on with the low coverage you're getting. Quote:
When a paint fails to completely hide the colour of the substrate, what's actually happening is that incident light is traveling through the paint film, reflecting off the substrate and traveling back through the paint film to your eye. Complete hide is achieved when none of light you see coming from the painted surface is light that reflected off the substrate. That means that either the incident light doesn't make it far enough through the paint to reach the substrate, or any reflected light doesn't make it all the way out of the paint film. Either way, the colour of the substrate doesn't affect the light you see emanating from the painted surface. When you have complete hide of the substrate, there won't be any difference in colour density between n, n+1 or n+20 coats of paint. That's cuz in none of those cases is the light you see coming from the paint being affected by the colour of the substrate. Cutting in with a brush, and then filling in with a roller, and looking for that picture framing effect is the way I decided on the paint I was going to use in my apartments. Pratt & Lambert Accolade Satin was the only SATIN paint I could find that would give me complete hide in one coat. Several eggshell and one or two velvet paints would give me complete hide in one coat, but P&L Accolade Satin provides a smoother, easier to clean finish, and still provided complete hide in one coat. Quote:
You're also probably getting close to complete hide with two coats, and in those vertical bands where those second coats overlap (and you have more than two coats), you're also getting better gloss development because the elastomeric coating is drying slower (more normally) and the first two coats have filled in the surface roughness of the stucco, thereby providing a smoother substrate for paint that overlapped along those vertical bands. I'm thinking a third coat with a brush or roller should result in your getting a coating of uniform colour density and gloss level over the entire coating surface. On subsequent walls, if it wuz me, I would use a latex primer to seal your stucco first. That'll prevent the water in the coating from being wicked into the stucco. Then do all your cutting in around windows and along edges with a brush. Maybe cut in a second time around the left or right sides of the windows and doors and see if you see any difference in colour density between the sides that have two coats and the sides that only have one. Keep applying coats until you cannot distinguish the difference in colour density between n and n+1 coats. Then you know you have complete hide. Now, apply multiple coats with a roller sleeve rather than a brush to speed up the painting process. Or, apply the first coat with a brush to fill in all the holes, and then apply subsequent coats with a roller sleeve. Not saying there's anything wrong with painting with a brush, but if a roller will give you faster paint application, I see no reason not to use a roller instead of a brush. Last edited by nestork : November 2nd 12 at 06:07 AM |
#18
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HELP! what's going wrong here?
Robert Macy wrote:
In trying to apply paint to a 'sandy' type stucco finish: Home previously spray painted with what appears to be extremely watered Dunn Edwards flat Interior/Exterior so bleached by the sun that there are tones lighter huge spotting, especially around cracking stucco. [done in 2008] So surface has essentially been primed. I asked the group and got a good recommendation for readily available Behr Masonry Stucco paint from Home Depot. The paint is thick, doesn't separate even days after shake mixing, and covers with one coat. I'm doing this myself, dont' want a lot of prep and mess and cleanup, so deemed to use a brush and just do sections at a time with any overlaps at corners/junctions, so won't show. I can do the painting in shade, in evening, so sun won't accelerate drying before curing. First problem is that it appeared that one gallon did around 80 sq ft !!! I tried cutting back, but can't even begin to get paint down into the 'holes' in the stucco. Have taken to poking at the wall with the bristles of the brush which almost works. Second problem is that the paint dries faster than I can move on. Meaning one can get a 'gummy' overlap between small sections as you move the ladder and scaffolding. Ok, I attributed that to very dry base surface. When done with this first coat, stood back and looked at it. Four days later, it still looked like I had used different colored paint sources, and the surface had a 'blotched' appearance. Looked like a quilt up on the wall consisting of square little 'islands' for the different sections I had done as I had moved along. Ok, first coat was a disaster so let's try it again. This time I added 2 oz of Floetrol to the half gallon of paint I was planning to use [recommended 4 oz per gallon]. Half gallon should do 80 sq ft on a second coat, right? WRONG! This time I moved as fast as possible. Set the ladder start at the top and come down to the stone facade as fast as possible, then move over and repeat until done. As I worked I completely filled EVERY hole I could see and verified that the surface had a nice wet sheen everywhere. This time I was moving so fast that even the overlaps were successful - they still had their wet sheen into the previously painted areas. I can live with using excessive paint [this is NOT color coverage, but liquid coverage] But I cannot live with the end result: As you stand and look at the wall you see very obviously well defined 'strips' down the wall. All the same color, but looks like sheets of wallpaper overlapping at their edges around 4 inches! It's been over 24 hours now with time to properly cure and dry and even the sun has hit the wall now, yet the effect is still there! I can't paint my house and have these ugly patterns left all over it when I'm done. What am I doing wrong here? Again spray paint is not an option [I have a $2,000 airless sprayer in storage I don't have access to since I own one I'm not allowed to buy another one]; rollers might be an option but the cleanup after doing each section will be monumental, plus not sure the roller can get paint down into all the nooks and crannies anyway. So, a brush is the most convenient way that I'd like to stay with. So, why has this turned into a fiasco? Why can't these walls be painted with a brush? What am I doing wrong here? You aren't waiting long enough. Your paint is going to take a month or more to totally cure and until it does you can expect to see variation in areas caused by more/less paint. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
#19
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HELP! what's going wrong here?
On Nov 2, 6:24*am, "dadiOH" wrote:
...snip... You aren't waiting long enough. *Your paint is going to take a month or more to totally cure and until it does you can expect to see variation in areas caused by more/less paint. ...snip.... I hope you're right. Trusting, I will now forge ahead! |
#20
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HELP! what's going wrong here?
On Nov 1, 10:00*pm, Smitty Two wrote:
In article , *Robert Macy wrote: I have absolutely NO idea how to solve this other than bite the bullet and spray the ****** out of it. I've been waiting for the stucco experts to come out and tell you that you aren't supposed to paint stucco. Say what?! Sounds good to me, but stucco absorbs rain like you wouldn't believe, stays wet for long time, and I swear smells moldy afterwards. Solution is to paint [read that as seal the surface and seal all those thousands of cracks] Not supposed to paint? Is there a URL that explains? |
#21
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HELP! what's going wrong here?
In article
, Robert Macy wrote: On Nov 1, 10:00*pm, Smitty Two wrote: In article , *Robert Macy wrote: I have absolutely NO idea how to solve this other than bite the bullet and spray the ****** out of it. I've been waiting for the stucco experts to come out and tell you that you aren't supposed to paint stucco. Say what?! Sounds good to me, but stucco absorbs rain like you wouldn't believe, stays wet for long time, and I swear smells moldy afterwards. Solution is to paint [read that as seal the surface and seal all those thousands of cracks] Not supposed to paint? Is there a URL that explains? This seems to be one of those "is duct tape a lubricant" issues. It's been discussed several times here, and you can search the archives. The position of the nay-sayers is this: shawnbennett wrote: DO NOT PAINT YOUR STUCCO!! You may as well wrap your house in plastic wrap, it will not breath and you WILL get mold. Stucco should never be painted. If you want the cracks fixed and maybe a updated texture, then a restucco is what you need. Depending on the stucco , you can fog coat it. But if you like painting every 3 years , go ahead and paint but you will be cleaning mold off of your window sills and the mold will strt to grow in the stucco along the bottom of the wall because there is no where for the humidity to go. Call 3 or 4 stucco contractors and you will see that generally a restucco is 25% cheaper than paint and if its done right , it should last you a lifetime. |
#22
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HELP! what's going wrong here?
On Nov 2, 10:24*am, Smitty Two wrote:
In article , *Robert Macy wrote: On Nov 1, 10:00*pm, Smitty Two wrote: In article , *Robert Macy wrote: I have absolutely NO idea how to solve this other than bite the bullet and spray the ****** out of it. I've been waiting for the stucco experts to come out and tell you that you aren't supposed to paint stucco. Say what?! Sounds good to me, but stucco absorbs rain like you wouldn't believe, stays wet for long time, and I swear smells moldy afterwards. Solution is to paint [read that as seal the surface and seal all those thousands of cracks] Not supposed to paint? Is there a URL that explains? This seems to be one of those "is duct tape a lubricant" issues. It's been discussed several times here, and you can search the archives. The position of the nay-sayers is this: shawnbennett wrote: DO NOT PAINT YOUR STUCCO!! You may as well wrap your house in plastic wrap, it will not breath and you WILL get mold. Stucco should never be painted. If you want the cracks fixed and maybe a updated texture, then a restucco is what you need. Depending on the stucco , you can fog coat it. But if you like painting every 3 years , go ahead and paint but you will be cleaning mold off of your window sills and the mold will strt to grow in the stucco along the bottom of the wall because there is no where for the humidity to go. Call 3 or 4 stucco contractors and you will see that generally a restucco is 25% cheaper than paint and if its done right , it should last you a lifetime.- Hide quoted text - - Show quoted text - But if the stucco is keeping moisture in, it is also keeping it out of the walls, so what moisture are you talking about, from the inside occupants of the house? |
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HELP! what's going wrong here?
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#24
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HELP! what's going wrong here?
On Fri, 2 Nov 2012 09:30:32 -0700 (PDT), "hr(bob) "
wrote: But if the stucco is keeping moisture in, it is also keeping it out of the walls, so what moisture are you talking about, from the inside occupants of the house? A metal weep screed it installed to stop water from collecting behind the stucco. Pic: http://localism.com/image_store/uploads/8/6/4/6/8/ar130755449886468.jpg Millions of stucco homes are painted (FL, AZ, NV, CA, NM....) |
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I'd like to address this issue of whether or not painting stucco will prevent it from "breathing", and thereby eliminating moisture from the walls of the house.
Moisture gets into the exterior walls of a house through leaks in the vapour barrier, such as at electrical outlets in exterior walls. That moisture accumulates over the course of the winter, forming condensation and frost during the winter, and that frost melts in the spring time. It's true that mold needs moisture to survive, but an occasional wetting once per year isn't enough to support mold growth. People should be aware that all latex paints (both interior and exterior), "breathe", whereas neither interior nor exterior oil based paints "breathe". The term "breathe" means that humidity can pass through the dry paint film, but not liquid water. Oil based paints don't breathe because they crosslink so densely that there isn't sufficient space between the oil molecules or the parts of the alkyd resins to allow water molecules to pass through the paint film. Both interior and exterior latex paints "breathe" because the gaps within and between acrylic resins are larger than the diameter of a single H2O molecule, but smaller than the distance between H2O molecules in liquid water. Consequently, individual H2O molecules can pass through a latex paint film relatively easily, but liquid water cannot pass through it. It's that ability to allow humidity to pass, but not liquid water that's really what's meant by that term "breathe". An acrylic resin can best be thought of as a long copper wire scrunched into a small ball. No matter how strong the person doing the scrunching, tiny gaps will remain between the segments of wire that make up each ball. Those gaps will be wide enough to allow a sufficiently fine powder, like sand say, to flow through the wire ball. Water molecules attract each other, and so liquid water cannot pass through that scrunched up wire ball unless the gaps between the wire segments are wider than the distance between H2O molecules in liquid water, and in latex paints, they're not. So, I don't see why painting stucco with a latex primer and exterior latex paint is going to prevent moisture inside the wall from evaporating through the paint film. Masonary paints are latex piants that have particularily wide gaps between the wire segments, but not so wide that they allow liquid water to pass through the paint film. That allows for the greatest "breathability" of the paint film to minimize freeze/thaw damage in masonary walls from moisture getting inside the wall and freezing. I really don't know how well elastomeric coatings breathe. |
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HELP! what's going wrong here?
On Nov 2, 10:36*am, Oren wrote:
On Fri, 2 Nov 2012 09:30:32 -0700 (PDT), "hr(bob) " wrote: But if the stucco is keeping moisture in, it is also keeping it out of the walls, so what moisture are you talking about, from the inside occupants of the house? A metal weep screed it installed to stop water from collecting behind the stucco. Pic: http://localism.com/image_store/uploads/8/6/4/6/8/ar130755449886468.jpg Millions of stucco homes are painted (FL, AZ, NV, CA, NM....) Yes, our home has a screen at the bottom edge. I remember someone saying that paint stopped water, but would let through moisture vapor. is that possible? |
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HELP! what's going wrong here?
On Nov 2, 2:08*pm, nestork wrote:
I'd like to address this issue of whether or not painting stucco will prevent it from "breathing", and thereby eliminating moisture from the walls of the house. Moisture gets into the exterior walls of a house through leaks in the vapour barrier, such as at electrical outlets in exterior walls. *That moisture accumulates over the course of the winter, forming condensation and frost during the winter, and that frost melts in the spring time. It's true that mold needs moisture to survive, but an occasional wetting once per year isn't enough to support mold growth. People should be aware that all latex paints (both interior and exterior), "breathe", whereas neither interior nor exterior oil based paints "breathe". *The term "breathe" means that humidity can pass through the dry paint film, but not liquid water. Oil based paints don't breathe because they crosslink so densely that there isn't sufficient space between the oil molecules or the parts of the alkyd resins to allow water molecules to pass through the paint film. Both interior and exterior latex paints "breathe" because the gaps within and between acrylic resins are larger than the diameter of a single H2O molecule, but smaller than the distance between H2O molecules in liquid water. Consequently, individual H2O molecules can pass through a latex paint film relatively easily, but liquid water cannot pass through it. *It's that ability to allow humidity to pass, but not liquid water that's really what's meant by that term "breathe". An acrylic resin can best be thought of as a long copper wire scrunched into a small ball. *No matter how strong the person doing the scrunching, tiny gaps will remain between the segments of wire that make up each ball. *Those gaps will be wide enough to allow a sufficiently fine powder, like sand say, to flow through the wire ball. *Water molecules attract each other, and so liquid water cannot pass through that scrunched up wire ball unless the gaps between the wire segments are wider than the distance between H2O molecules in liquid water, and in latex paints, they're not. So, I don't see why painting stucco with a latex primer and exterior latex paint is going to prevent moisture inside the wall from evaporating through the paint film. Masonary paints are latex piants that have particularily wide gaps between the wire segments, but not so wide that they allow liquid water to pass through the paint film. *That allows for the greatest "breathability" of the paint film to minimize freeze/thaw damage in masonary walls from moisture getting inside the wall and freezing. I really don't know how well elastomeric coatings breathe. -- nestork Thanks for the detailed explanation. It is my understanding that here in Arizona the moisture barrier is reversed compared to homes in areas that are cold/freezing. Think about it we run AC here, making the interior colder than exterior at least 9 months a year. I don't run it at all if I can help it. but you see the concept of the inside being cooler than the outside. However, when working on the exterior wall to reposition the stove top vent hood; the barriers looked like they were still set up for a 'freezing' climate. consisting of interior paint joint compound skim coat gypsum drywall nylong netting[ chicken wire gaps fluffy fibre glass insulation blown in between the studs 1/2 inch sheathing two layers of tar paper stucco exterior paint Upon running the stove top fan am convinced the house is, nor could ANY house could be, tight enough to need super breathing requirements. |
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I don't think you'll have any problem either.
Not only is Arizona a dry climate, but cold air escaping through a hole in your vapour barrier is going to warm up and absorb any moisture in the walls, which is the opposite of what happens in the winter where I live. I'm just surprised that it's taking three coats to get a decent looking coating over your stucco. I expect that's because the first coat you're putting on is acting as a sealer for the second coat. I think priming with a latex primer would reduce the amount of elastomeric coating you have to put on. PS: All acrylic and PVA resins have enough elasticity to stretch and shrink with wood outdoors, and primers don't need to have UV resistance and mildew resistance because they're meant to be covered by a top coat that would keep the sunlight and moisture off of them. If you ever see latex primers listed as an "Interior Latex Primer" or an "Exterior Latex Primer", it's likely that the only difference is that the latter uses a coalescing solvent that smells a lot, whereas the former uses one that doesn't. In hospitals and commercial settings it's often important not to have the latex primer or paint smell as the coalescing solvents evaporate because some people can get headaches from inhaling those fumes, and generally, the less the solvent smells, the less people will be affected by it. Last edited by nestork : November 3rd 12 at 03:37 PM |
#29
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HELP! what's going wrong here?
On 11/2/2012 3:08 PM, nestork wrote:
There seem to be 2 opinions on painting. One is for stucco over concrete block which is common in the south. It is very common to paint the stucco. The other is stucco over wood frame. The advice is to redash, which is the thin stucco material used as the surface on the original stucco. Paint turns the stucco into a surface that requires relatively frequent repainting. You don't have to redash very often. (I don't know why that logic doesn't apply to cement block stucco.) Redash can be pigmented. So, I don't see why painting stucco with a latex primer and exterior latex paint is going to prevent moisture inside the wall from evaporating through the paint film. Masonary paints are latex piants that have particularily wide gaps between the wire segments, but not so wide that they allow liquid water to pass through the paint film. That allows for the greatest "breathability" of the paint film to minimize freeze/thaw damage in masonary walls from moisture getting inside the wall and freezing. Thanks for your usual detailed information. The advice on painting stucco, in particular, is do not use oil paint, which prevents 'breathing'. The outer surface of the wall has to 'breathe' better than inside the house surface. It can be a particular problem on older houses that do not have the vapor barriers common on newer houses. I would note there is also EFIS. Don't know if it is still being used, but there were some horror stories, which may have been from improper use, where there was extensive mold inside the walls. Very expensive to fix. |
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HELP! what's going wrong here?
In article ,
bud-- wrote: I would note there is also EFIS. Electronic Flight Instrumentation System? I'd rather have steam gauges. |
#31
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HELP! what's going wrong here?
On Fri, 2 Nov 2012 19:02:33 -0700 (PDT), Robert Macy
wrote: On Nov 2, 10:36*am, Oren wrote: On Fri, 2 Nov 2012 09:30:32 -0700 (PDT), "hr(bob) " wrote: But if the stucco is keeping moisture in, it is also keeping it out of the walls, so what moisture are you talking about, from the inside occupants of the house? A metal weep screed it installed to stop water from collecting behind the stucco. Pic: http://localism.com/image_store/uploads/8/6/4/6/8/ar130755449886468.jpg Millions of stucco homes are painted (FL, AZ, NV, CA, NM....) Yes, our home has a screen at the bottom edge. I remember someone saying that paint stopped water, but would let through moisture vapor. is that possible? Dang if I know, Robert. The elastomeric paint is smarter than me... I use it on my stucco. |
#32
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HELP! what's going wrong here?
On Nov 3, 8:04*am, nestork wrote:
I don't think you'll have any problem either. Not only is Arizona a dry climate, but cold air escaping through a hole in your vapour barrier is going to warm up and absorb any moisture in the walls, which is the opposite of what happens in the winter where I live. I'm just surprised that it's taking three coats to get a decent looking coating over your stucco. *I expect that's because the first coat you're putting on is acting as a sealer for the second coat. *I think priming with a latex primer would reduce the amount of elastomeric coating you have to put on. PS: All acrylic and PVA resins have enough elasticity to stretch and shrink with wood outdoors, and primers don't need to have UV resistance and mildew resistance because they're meant to be covered by a top coat that would keep the sunlight and moisture off of them. *If you ever see latex primers listed as an "Interior Latex Primer" or an "Exterior Latex Primer", it's likely that the only difference is that the latter uses a coalescing solvent that smells a lot, whereas the former uses one that doesn't. *In hospitals and commercial settings it's often important not to have the latex primer or paint smell as the coalescing solvents evaporate because some people can get headaches from inhaling those fumes, and generally, the less the solvent smells, the less people will be affected by it. -- nestork When I did the exterior walls as a SECOND coat over previous attempts, I got these vertical 'llines' that show up because of pattern recognition. Someone said wait a month they'll disappear, but I think the lines come from a change in surface 'smoothness' which will never change with time. They do seem to be diminishing with time, not sure why. As an experiment, I painted only half a cupalo(sp?) tower on the south side of the home. A week ago, I only painted half vertically because of the height and difficulty to reach. Today I painted the second haf and there is absolutely NO vertical line caused by an overlap! There is an apparent change of color, which could be attributed to drying time. We'll see. So here it is. Wet overlap shows up, but dry overlap does not ?! That makes no sense to me, but if it's true I'll simply adjust my painting around it. |
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Both wet and dry overlap should result in the same increase in colour density until you reach complete hide of the substrate colour. Once you're at complete hide, adding more coats or more paint anywhere won't cause any change in colour density.
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#34
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HELP! what's going wrong here?
Robert Macy wrote:
When I did the exterior walls as a SECOND coat over previous attempts, I got these vertical 'llines' that show up because of pattern recognition. Someone said wait a month they'll disappear, but I think the lines come from a change in surface 'smoothness' which will never change with time. They do seem to be diminishing with time, not sure why. As an experiment, I painted only half a cupalo(sp?) tower on the south side of the home. A week ago, I only painted half vertically because of the height and difficulty to reach. Today I painted the second haf and there is absolutely NO vertical line caused by an overlap! There is an apparent change of color, which could be attributed to drying time. We'll see. So here it is. Wet overlap shows up, but dry overlap does not ?! That makes no sense to me, but if it's true I'll simply adjust my painting around it. Why does that surprise you? If you overlap wet paint you are retarding what was already there - partially dried - from drying further. It will, eventually. In addition to difference in color, you will also get a difference in sheen. IIRC, you are painting over previous paint that is chalky. On an old house. Lord knows how many coats of paint are on it but that old, chalky paint is going to suck moisture out of the new paint. Put on a coat, moisture is sucked; come back later and apply more paint overlapping the old and you are going to get a stripe where they overlap because the overlapped area has been sealed. Not hard to understand. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
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HELP! what's going wrong here?
On Nov 3, 9:38*pm, nestork wrote:
Both wet and dry overlap should result in the same increase in colour density until you reach complete hide of the substrate colour. *Once you're at complete hide, adding more coats or more paint anywhere won't cause any change in colour density. -- nestork Not sure I'm fighting 'colour density' because 1. the first coat just appeared 'blotchy', but appeared to give full coverage, with any pattern underneath caused by variations of sun bleaching, etc do not seem to translate through to change the apearance of the first coat. 2. with a very solid looking colour, the second coat seems to have these vertical stripes of overlap. I don't see any pattern, well not much, burning through from the first coat's blotches. The more and more I look at this, the more and more I think I'm fighting surface textural changes. Less coat - surface is slightly rougher. More coat - the surface is slightly smoother. And, the eye is quick to perceive a pattern, any pattern. But, your point is well taken, I have completely discounted the potential for colour density changes. From memory, the eye is supposed to be more sensitive to colour shift than to light/dark shift. With that in mind, it would explain why the first coat hasn't burned through to the second, only the second shows. No, if colour density were an issue, it should show up in the second coat over the first, and does not seem to. I'm caught between hoping it's only a matter of true curing/drying time and just careful applications. I add Floetrol at 4 oz per gallon [recommended amount] and the paint seems to still be sticky, gooey, and dry before I can go very far along the wall. The paint even forms a slight scum on top of the surface in the container. Keep in mind this is evening painting, and is painting on the shaded walls, not in the sun, nor any surface in the sun. So there should be nothing except our 10% humidity accellerating the paint's drying. |
#36
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HELP! what's going wrong here?
On Nov 4, 6:27*am, "dadiOH" wrote:
...snip.... Why does that surprise you? *If you overlap wet paint you are retarding what was already there - partially dried - from drying further. *It will, eventually. *In addition to difference in color, you will also get a difference in sheen. IIRC, you are painting over previous paint that is chalky. *On an old house. Lord knows how many coats of paint are on it but that old, chalky paint is going to suck moisture out of the new paint. *Put on a coat, moisture is sucked; come back later and apply more paint overlapping the old and you are going to get a stripe where they overlap because the overlapped area has been sealed. *Not hard to understand. ...snip... What?! retarding paint's drying changes its colour?! Difference in sheen I believe. But that's due to the surface gumming up. I used to use Easy OFF Window Cleaner, comes in an aerosol spray can, to lightly mist the surface of latex and be able to brush over any variation making it uniform, but alas, they've discontinued that product. Used to be able to use that product to go back hours later nd still make corrections, too. First, coat should be sensitive to what's underneath. That's why I chose to water wash and physically scrub the old coat. Which did show a colooured run off of chalky paint and dirt from wherever. I saw a difference with the way the paint went on and recommend always cleaning the base surface. But, the problem that prompted me to post is NOT with respect to the first coat, but the second coat, which of course is going over an almost acceptable surface of paint. Second coat was actually an experiment. I don't want to do two coats on this house, too expensive, and too labor intensive. |
#37
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HELP! what's going wrong here?
Robert Macy wrote:
On Nov 4, 6:27 am, "dadiOH" wrote: ...snip.... Why does that surprise you? If you overlap wet paint you are retarding what was already there - partially dried - from drying further. It will, eventually. In addition to difference in color, you will also get a difference in sheen. IIRC, you are painting over previous paint that is chalky. On an old house. Lord knows how many coats of paint are on it but that old, chalky paint is going to suck moisture out of the new paint. Put on a coat, moisture is sucked; come back later and apply more paint overlapping the old and you are going to get a stripe where they overlap because the overlapped area has been sealed. Not hard to understand. ...snip... What?! retarding paint's drying changes its colour? I didn't say that. I did say that paint can take many days to completely dry/cure and that the color and sheen won't be uniform until that time has passed. __________ ! Difference in sheen I believe. But that's due to the surface gumming up. I used to use Easy OFF Window Cleaner, comes in an aerosol spray can, to lightly mist the surface of latex and be able to brush over any variation making it uniform, but alas, they've discontinued that product. Used to be able to use that product to go back hours later nd still make corrections, too. First, coat should be sensitive to what's underneath. That's why I chose to water wash and physically scrub the old coat. Which did show a colooured run off of chalky paint and dirt from wherever. I saw a difference with the way the paint went on and recommend always cleaning the base surface. But, the problem that prompted me to post is NOT with respect to the first coat, but the second coat, which of course is going over an almost acceptable surface of paint. Second coat was actually an experiment. I don't want to do two coats on this house, too expensive, and too labor intensive. Let me try to clarify... 1. First coat over existing, old, chalky paint. Coat dries - dries, not cures - relatively fast because old paint absorbed some moisture. 2. Second coat, partially lapping #1. The lapped part is a different color and/or sheen because the first coat under it has sealed the surface and the lapped part is drying/curing more slowly than paint over the old, chalky surface. -- dadiOH ____________________________ Winters getting colder? Tired of the rat race? Maybe just ready for a change? Check it out... http://www.floridaloghouse.net |
#38
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HELP! what's going wrong here?
On Sun, 4 Nov 2012 06:30:26 -0800 (PST), Robert Macy
wrote: The more and more I look at this, the more and more I think I'm fighting surface textural changes. Less coat - surface is slightly rougher. More coat - the surface is slightly smoother. And, the eye is quick to perceive a pattern, any pattern. Has this wall been modified? During construction that changed plans. Maybe a different crew stuccoed the house and another made a repair. I can see faults in some stucco houses around here. I'm lucky not to have such a problem. |
#39
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HELP! what's going wrong here?
On Nov 4, 2:08*pm, "dadiOH" wrote:
Robert Macy wrote: On Nov 4, 6:27 am, "dadiOH" wrote: ...snip.... Why does that surprise you? If you overlap wet paint you are retarding what was already there - partially dried - from drying further. It will, eventually. In addition to difference in color, you will also get a difference in sheen. IIRC, you are painting over previous paint that is chalky. On an old house. Lord knows how many coats of paint are on it but that old, chalky paint is going to suck moisture out of the new paint. Put on a coat, moisture is sucked; come back later and apply more paint overlapping the old and you are going to get a stripe where they overlap because the overlapped area has been sealed. Not hard to understand. ...snip... What?! retarding paint's drying changes its colour? I didn't say that. *I did say that paint can take many days to completely dry/cure and that the color and sheen won't be uniform until that time has passed. __________ ! Difference in sheen I believe. But that's due to the surface gumming up. I used to use Easy OFF Window Cleaner, comes in an aerosol spray can, to lightly mist the surface of latex and be able to brush over any variation making it uniform, but alas, they've discontinued that product. *Used to be able to use that product to go back hours later nd still make corrections, too. First, coat should be sensitive to what's underneath. That's why I chose to water wash and physically scrub the old coat. Which did show a colooured run off of chalky paint and dirt from wherever. I saw a difference with the way the paint went on and recommend always cleaning the base surface. But, the problem that prompted me to post is NOT with respect to the first coat, but the second coat, which of course is going over an almost acceptable surface of paint. *Second coat was actually an experiment. I don't want to do two coats on this house, too expensive, and too labor intensive. Let me try to clarify... 1. First coat over existing, old, chalky paint. *Coat dries - dries, not cures - relatively fast because old paint absorbed some moisture. 2. Second coat, partially lapping #1. *The lapped part is a different color and/or sheen because the first coat under it has sealed the surface and the lapped part is drying/curing more slowly than paint over the old, chalky surface. -- dadiOH ____________________________ Winters getting colder? *Tired of the rat race? Maybe just ready for a change? *Check it out...http://www.floridaloghouse.net I'm trying a new section that has been physically scrubbed with brush and plain water. We'll see what happens over that. I hope all these problems are just a matter of drying. However, Where I put the two coats has the 'decidedly' obvious stripes ONLY from the last coat. Been drying since I started this thread. On the tower which was difficult to reach so I painted one half side, waited three days, painted the other half; has absolutely NO line at the overlap, but does appear to be two diffierent colors! Oh well, win one lose one. |
#40
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HELP! what's going wrong here?
On Nov 4, 3:21*pm, Oren wrote:
On Sun, 4 Nov 2012 06:30:26 -0800 (PST), Robert Macy wrote: The more and more I look at this, the more and more I think I'm fighting surface textural changes. Less coat - surface is slightly rougher. More coat - the surface is slightly smoother. And, the eye is quick to perceive a pattern, any pattern. Has this wall been modified? *During construction that changed plans. Maybe a different crew stuccoed the house and another made a repair. I can see faults in some stucco houses around here. I'm lucky not to have such a problem. No appears to have been done all at one time. Plus, thiis specific area is not large, around 8 feet high by 10 feet wide. I have seen their starts and stops, but this is not it. Their patterns are horizontal. My painting patterns are vertical, since I paint from top to bottom. |
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