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#1
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HVLP question
I purchased a cheap HVLP gun at HF to do some spraying. The question I
have is about pressure. the manual states to run it about 40psi, and never run it higher than that. i have a small regulator at the gun, and one at the compressor end. when i set the compressor regulator at 45, i get about 40 at the gun (i have to use about 75' of 3/8" hose to get where i need to spray as the compressor is a large tank in the garashop). however, when i start spraying, it drops down to the 20 psi range whilst i'm spraying, and going back up when i release the trigger. when i crank the pressure up at the compressor regulator, the pressure then, of course, goes up at the gun. when i start spraying, the pressure drops pretty quickly, then rises back up when stopping spraying. this is my first experience with an hvlp, so is this normal? is the 20psi during spraying good enough? it seems to be spraying a pretty fine mist at 20psi when i did my testing with plain water. what i'm spraying is mostly water anyway, so it shouldn't be too much different viscosity. thanks, charlie |
#2
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HVLP question
what i'm spraying is mostly water anyway, so it shouldn't be too much different viscosity. thanks, charlie My HVLP system has a turbo fan but I assume you are using straight pressure HLVP conversion type gun. When I use a regular spray gun and with my HVLP which uses compressor and turbo fan, I leave the compressor at 110 as always and have a regulator on the gun. I don't watch the exact setting on the gaugae I go by how it is spraying but I think I usually run around 25-30 at the gun. I don't notice a drop. If you are using a 1/4 or 3/8 hose you might want to grab a 1/2 hose to add volume. At that distance it can make a difference. |
#3
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HVLP question
On Wed, 16 Nov 2011 11:00:20 -0700, chaniarts wrote:
I purchased a cheap HVLP gun at HF to do some spraying. The question I have is about pressure. the manual states to run it about 40psi, and never run it higher than that. i have a small regulator at the gun, and one at the compressor end. when i set the compressor regulator at 45, i get about 40 at the gun (i have to use about 75' of 3/8" hose to get where i need to spray as the compressor is a large tank in the garashop). however, when i start spraying, it drops down to the 20 psi range whilst i'm spraying, and going back up when i release the trigger. when i crank the pressure up at the compressor regulator, the pressure then, of course, goes up at the gun. when i start spraying, the pressure drops pretty quickly, then rises back up when stopping spraying. this is my first experience with an hvlp, so is this normal? is the 20psi during spraying good enough? it seems to be spraying a pretty fine mist at 20psi when i did my testing with plain water. what i'm spraying is mostly water anyway, so it shouldn't be too much different viscosity. thanks, charlie Use a much larger hose for the first 60 feet. basilisk |
#4
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HVLP question
On Nov 16, 12:00*pm, chaniarts wrote:
however, when i start spraying, it drops down to the 20 psi range whilst i'm spraying, and going back up when i release the trigger. when i crank the pressure up at the compressor regulator, the pressure then, of course, goes up at the gun. when i start spraying, the pressure drops pretty quickly, then rises back up when stopping spraying. Keep the pressure up at the compressor, just about at its limit. You are going about it correctly by controlling the output to the gun with a separate regulator at the gun handle. More compression behind the gun will assure you that your compressor will not cycle as often as low pressure. I have a couple of those HF HVLP guns and they are surprisingly good. I don't know your model (not that it would matter) but I usually find the sweet spot for spraying at about 12 - 18 pounds at the gun. If you are shooting at 40psi to the gun, no doubt you are draining your compressor quickly. Remember, High Velocity, LOW Pressure. If you can't get your material out at lower pressures, thin it out more. When I was learning to shoot with a HVLP gun powered by a compressor, I set it up like a high pressure gun. My compressor couldn't keep up, I had lots of overspray and drift, and didn't see any savings in material. After really woodshedding that gun and getting some excellent advice, I got it to where I want it. Remember, and HVLP setup will not atomize your finish material the way an old fashioned high pressure spray will. It isn't designed to work that way, hence, it simply won't. this is my first experience with an hvlp, so is this normal? is the 20psi during spraying good enough? it seems to be spraying a pretty fine mist at 20psi when i did my testing with plain water. what i'm spraying is mostly water anyway, so it shouldn't be too much different viscosity. Shooting water shouldn't be a trick for any gun/compressor at any pressure. Keep the pressure low, and adjust your feed and pressure as needed to keep the water flowing. Robert |
#6
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HVLP question
chaniarts wrote:
On 11/16/2011 12:36 PM, wrote: I have a couple of those HF HVLP guns and they are surprisingly good. I don't know your model (not that it would matter) but I usually find the sweet spot for spraying at about 12 - 18 pounds at the gun. If you are shooting at 40psi to the gun, no doubt you are draining your compressor quickly. Remember, High Velocity, LOW Pressure. this is the one i picked up http://www.harborfreight.com/professional-automotive-hvlp-spray-gun-kit-94572.html I have recommended a lot of Harbor Freight guns to people over the years, and some of their models are very good guns - especially for the price. That said - I would not consider the model this link points to, to be and HVLP gun. At 35-40 psi, this gun is in the league of the old siphon guns. HVLP should be running under 20 psi. Depending on what I'm shooting in my Devilibiss HVLP, I'm anywhere between 13 psi and 23 psi. You can't expect to get ~10 psi at the cap if the input pressure gets too high. The guns are not magic, and can only do so much in reducing the delivery pressure. At a point, you're not really delivering HVLP anymore. Compare the material useage and the overspray with that of an old siphon gun, and I'll bet you don't see a lot of difference. -- -Mike- |
#7
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HVLP question
On Nov 17, 10:26*am, "Mike Marlow"
wrote: chaniarts wrote: On 11/16/2011 12:36 PM, wrote: I have a couple of those HF HVLP guns and they are surprisingly good. I don't know your model (not that it would matter) but I usually find the sweet spot for spraying at about 12 - 18 pounds at the gun. *If you are shooting at 40psi to the gun, no doubt you are draining your compressor quickly. *Remember, High Velocity, LOW Pressure. this is the one i picked up http://www.harborfreight.com/professional-automotive-hvlp-spray-gun-k.... I have recommended a lot of Harbor Freight guns to people over the years, and some of their models are very good guns - especially for the price. That said - I would not consider the model this link points to, to be and HVLP gun. *At 35-40 psi, this gun is in the league of the old siphon guns. HVLP should be running under 20 psi. *Depending on what I'm shooting in my Devilibiss HVLP, I'm anywhere between 13 psi and 23 psi. *You can't expect to get ~10 psi at the cap if the input pressure gets too high. *The guns are not magic, and can only do so much in reducing the delivery pressure. *At a point, you're not really delivering HVLP anymore. *Compare the material useage and the overspray with that of an old siphon gun, and I'll bet you don't see a lot of difference. -- -Mike- Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) So easy to adjust, sprays upside down. You can get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy. http://www.danielsmith.com/Item--i-155-030-005 |
#8
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HVLP question
On Thu, 17 Nov 2011 08:11:28 -0800 (PST), Robatoy
wrote: Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) Too easy! So easy to adjust, sprays upside down. You can How often do you find yourself hanging by your ankles to shoot a bit of paint, sir? Inquiring minds, y'know... get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. What do you use your guns for, Toy? I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy. http://www.danielsmith.com/Item--i-155-030-005 http://www.chicagoairbrushsupply.com/iwrg3mispgun.html Save $75 if you haven't already bought one. -- Most powerful is he who has himself in his own power. -- Seneca |
#9
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HVLP question
On Nov 17, 11:43*am, Larry Jaques
wrote: On Thu, 17 Nov 2011 08:11:28 -0800 (PST), Robatoy wrote: Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) Too easy! * So easy to adjust, sprays upside down. You can How often do you find yourself hanging by your ankles to shoot a bit of paint, sir? *Inquiring minds, y'know... get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. What do you use your guns for, Toy? I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy.http://www.danielsmith.com/Item--i-155-030-005 http://www.chicagoairbrushsupply.com...pgun.html*Save $75 if you haven't already bought one. nice CATCH!!! Thankee kindly, Sir! I will order. |
#10
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HVLP question
On Nov 17, 11:43*am, Larry Jaques
wrote: On Thu, 17 Nov 2011 08:11:28 -0800 (PST), Robatoy wrote: Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) Too easy! * So easy to adjust, sprays upside down. You can How often do you find yourself hanging by your ankles to shoot a bit of paint, sir? *Inquiring minds, y'know... get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. What do you use your guns for, Toy? I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy.http://www.danielsmith.com/Item--i-155-030-005 http://www.chicagoairbrushsupply.com...pgun.html*Save $75 if you haven't already bought one. -- Most powerful is he who has himself in his own power. * * * * * * * * * * * * * * * * * * * * * *-- Seneca I was so thrilled with keeping 75 smackereoonies in my pockets that I forgot to answer your question. I do not like brushing paint. I do so much better spraying and signs are perfect candidates for spraying primers, base coats, and other trickery. |
#11
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HVLP question
On Thu, 17 Nov 2011 16:33:13 -0800 (PST), Robatoy
wrote: On Nov 17, 11:43*am, Larry Jaques wrote: On Thu, 17 Nov 2011 08:11:28 -0800 (PST), Robatoy wrote: Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) Too easy! * So easy to adjust, sprays upside down. You can How often do you find yourself hanging by your ankles to shoot a bit of paint, sir? *Inquiring minds, y'know... get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. What do you use your guns for, Toy? Hiding your use, eh? I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy.http://www.danielsmith.com/Item--i-155-030-005 http://www.chicagoairbrushsupply.com...pgun.html*Save $75 if you haven't already bought one. nice CATCH!!! Thankee kindly, Sir! I will order. Jewelcome. -- Most powerful is he who has himself in his own power. -- Seneca |
#12
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HVLP question
On Nov 17, 10:21*pm, Larry Jaques
wrote: On Thu, 17 Nov 2011 16:33:13 -0800 (PST), Robatoy wrote: On Nov 17, 11:43*am, Larry Jaques wrote: On Thu, 17 Nov 2011 08:11:28 -0800 (PST), Robatoy wrote: Even if the job isn't very big, I'm a pot-fed kinda fella. (PUT those wisecracks away!!LOL) Too easy! * So easy to adjust, sprays upside down. You can How often do you find yourself hanging by your ankles to shoot a bit of paint, sir? *Inquiring minds, y'know... get the whole shebang for 60 bucks for a 2 litre. The cleaning is only a bit more work, and just the reduced fatigue in the spray arm alone is worth it. Currently, I own a couple of HVLP guns, a 2 litre pot and a 5qt floor pot. Nice lightweight hoses and a gravity fed HVLP with a 2 mil tip for thick stuff like Jay Cooke primer. What do you use your guns for, Toy? Hiding your use, eh? I can kick my ass for selling my Iwata gun, but it has since been improved upon, but a bit spendy.http://www.danielsmith.com/Item--i-155-030-005 http://www.chicagoairbrushsupply.com...pgun.html*Save $75 if you haven't already bought one. nice CATCH!!! Thankee kindly, Sir! I will order. Jewelcome. -- Most powerful is he who has himself in his own power. * * * * * * * * * * * * * * * * * * * * * *-- Seneca What kind of stuff do I spray? A lot of Jay Cooke primer in my signs, a lot of One-shot enamel in fades and back-grounds on those signs, the odd piece of furniture, a quick refinish for an old couple's kitchen... The rims on my kids car.... etc... |
#13
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HVLP question
On Fri, 18 Nov 2011 16:40:05 -0800 (PST), Robatoy
wrote: On Nov 17, 10:21*pm, Larry Jaques wrote: What do you use your guns for, Toy? What kind of stuff do I spray? A lot of Jay Cooke primer in my signs, a lot of One-shot enamel in fades and back-grounds on those signs, the odd piece of furniture, a quick refinish for an old couple's kitchen... The rims on my kids car.... etc... "Stuff", got it. Thanks. http://www.haradhesive.com/jay_cooke.html Looks like good stuff. Expensive? -- Most powerful is he who has himself in his own power. -- Seneca |
#14
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HVLP question
On Nov 19, 11:47*am, Larry Jaques
wrote: On Fri, 18 Nov 2011 16:40:05 -0800 (PST), Robatoy wrote: On Nov 17, 10:21*pm, Larry Jaques wrote: What do you use your guns for, Toy? What kind of stuff do I spray? A lot of Jay Cooke primer in my signs, a lot of One-shot enamel in fades and back-grounds on those signs, the odd piece of furniture, a quick refinish for an old couple's kitchen... The rims on my kids car.... etc... "Stuff", got it. *Thanks. http://www.haradhesive.com/jay_cooke.html*Looks like good stuff. Expensive? -- Most powerful is he who has himself in his own power. * * * * * * * * * * * * * * * * * * * * * *-- Seneca The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 |
#15
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HVLP question
Robatoy wrote:
The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 Do you have any problems with shrinkage? -- -Mike- |
#16
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HVLP question
On Sat, 19 Nov 2011 09:19:07 -0800 (PST), Robatoy
wrote: On Nov 19, 11:47*am, Larry Jaques wrote: On Fri, 18 Nov 2011 16:40:05 -0800 (PST), Robatoy wrote: On Nov 17, 10:21*pm, Larry Jaques wrote: What do you use your guns for, Toy? What kind of stuff do I spray? A lot of Jay Cooke primer in my signs, a lot of One-shot enamel in fades and back-grounds on those signs, the odd piece of furniture, a quick refinish for an old couple's kitchen... The rims on my kids car.... etc... "Stuff", got it. *Thanks. http://www.haradhesive.com/jay_cooke.html*Looks like good stuff. Expensive? The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 Not bad, $23.25/gal. One thing you need for an outdoor sign is a paint which will handle the temp extremes without cracking or flaking for a long while. -- The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man. -- George Bernard Shaw |
#17
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HVLP question
On Nov 19, 4:58*pm, "Mike Marlow"
wrote: Robatoy wrote: The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 Do you have any problems with shrinkage? Only when I swim in cold water. .. .. .. .. .. .. .. .. .. .. Come ON! Somebody had to say that.. Now. re paint... No problem with shrinkage. |
#18
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HVLP question
On Nov 19, 7:57*pm, Larry Jaques
wrote: On Sat, 19 Nov 2011 09:19:07 -0800 (PST), Robatoy wrote: On Nov 19, 11:47*am, Larry Jaques wrote: On Fri, 18 Nov 2011 16:40:05 -0800 (PST), Robatoy wrote: On Nov 17, 10:21*pm, Larry Jaques wrote: What do you use your guns for, Toy? What kind of stuff do I spray? A lot of Jay Cooke primer in my signs, a lot of One-shot enamel in fades and back-grounds on those signs, the odd piece of furniture, a quick refinish for an old couple's kitchen... The rims on my kids car.... etc... "Stuff", got it. *Thanks. http://www.haradhesive.com/jay_cooke.html*Looks like good stuff. Expensive? The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 Not bad, $23.25/gal. *One thing you need for an outdoor sign is a paint which will handle the temp extremes without cracking or flaking for a long while. -- The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man. * * * * * * * * * * * * * * * * * * * * * -- George Bernard Shaw There are signs around here that survived Banana/Blizzard weather for 20 years. It's stuff designed for the job. |
#19
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HVLP question
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#20
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HVLP question
Do you have any problems with shrinkage?
Robatoy wrote: Only when I swim in cold water. ----------------------------- Nuther reason I came to SoCal. "Throw another log on the fire, Hustle up another cup of tea." Lew |
#21
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HVLP question
On Sat, 19 Nov 2011 17:27:41 -0800 (PST), Robatoy
wrote: On Nov 19, 4:58*pm, "Mike Marlow" wrote: Robatoy wrote: The bit of extra money per gallon, gets reimbursed by the serious build-up. I'll look at my invoices, around mid- 30$ http://www.raycosignsupply.com/852 Do you have any problems with shrinkage? Only when I swim in cold water. . . . Come ON! Somebody had to say that.. "Boy? Who you callin' boy? You musta seen me after a cold showah." Now. re paint...No problem with shrinkage. I wouldn't think so. Is that an acrylic? I forgot to read the MSDS. -- The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man. -- George Bernard Shaw |
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