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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Plastering - How to get a better finish ?
Just had another go at plastering a wall at the weekend. In general things
went ok, thanks to all the tips that I have picked up from this Newsgroup, but I think that I can do better with the final finish. When I use large sweeping arc movements , I tend to leave what look like tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? Would I be better doing straight horizontal or vertical lines ? Maybe I am holding the trowel at the wrong angle. Should I hold the trowel as near as flat as possible to the wall ? I would be most grateful for any suggestions as to how I can improve my finish TIA Con. |
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Plastering - How to get a better finish ?
On Tue, 29 Jun 2004 09:33:19 +0100, "Red Devil"
wrote: Just had another go at plastering a wall at the weekend. In general things went ok, thanks to all the tips that I have picked up from this Newsgroup, but I think that I can do better with the final finish. When I use large sweeping arc movements , I tend to leave what look like tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? Would I be better doing straight horizontal or vertical lines ? Maybe I am holding the trowel at the wrong angle. Should I hold the trowel as near as flat as possible to the wall ? I would be most grateful for any suggestions as to how I can improve my finish TIA Con. Are you using a "Derby" to finish off with?. Plastering,especially large scale plastering is a thing learned by experience and practice. It can be helped greatly with good preparation,good technique and tools and most crucially,the right mix/consistency.. joe |
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Plastering - How to get a better finish ?
"tarquinlinbin" wrote in message ... On Tue, 29 Jun 2004 09:33:19 +0100, "Red Devil" wrote: Just had another go at plastering a wall at the weekend. In general things went ok, thanks to all the tips that I have picked up from this Newsgroup, but I think that I can do better with the final finish. When I use large sweeping arc movements , I tend to leave what look like tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? Would I be better doing straight horizontal or vertical lines ? Maybe I am holding the trowel at the wrong angle. Should I hold the trowel as near as flat as possible to the wall ? I would be most grateful for any suggestions as to how I can improve my finish TIA Con. Are you using a "Derby" to finish off with?. Plastering,especially large scale plastering is a thing learned by experience and practice. It can be helped greatly with good preparation,good technique and tools and most crucially,the right mix/consistency.. joe Joe I am not using a darby to finish off with. I have applied 2 coats of MultiFinish, putting the second coat on before the first has completely gone off. I am following the general instruction - "Put the first coat on, wash tools, have a cup of tea, stand back and admire work", by which point it is tiime to go back to the start and put the second coat on. I think that my prep is ok. I have PVAd the wall a few times with a 1:5 solution, applying the plaster while the 1:3 solution is a bit tacky. I have a Marshalltown trowel, so I can't blame that either !!! I obviously need lots more practice Con |
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Plastering - How to get a better finish ?
In article ,
tarquinlinbin writes: On Tue, 29 Jun 2004 09:33:19 +0100, "Red Devil" wrote: Just had another go at plastering a wall at the weekend. In general things went ok, thanks to all the tips that I have picked up from this Newsgroup, but I think that I can do better with the final finish. When I use large sweeping arc movements , I tend to leave what look like tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? I'm not sure I know what you mean. If you mean vibration marks, that often happens. When you have finished they can be very visible, but if you polished off correctly, you won't be able to feel them at all, so they should completely vanish when you decorate. Would I be better doing straight horizontal or vertical lines ? No. Maybe I am holding the trowel at the wrong angle. Should I hold the trowel as near as flat as possible to the wall ? No. You may not have wet the surface enough when polishing -- you should be dragging a small quantity of water along the surface with the trowel edge. This carries fine plaster particles which are broken off the peaks by the trowel edge and deposits them in any depressions, which is how the polishing works. Flick water over the surface with a large brush (or used a plant sprayer) before you draw the trowel across. The trowel may be too new -- i.e. not worn in enough. Plastering is much easier using some rusty old used trowel you dig out of the garden shed (providing you can polish it up along the edges) than by using a new trowel. Traditionally, a plasterer would buy a new trowel and give it to a renderer for a few weeks to break it in and wear off the sharp corners, before taking it back and using it for real plasterwork. You can use a house brick with a good flat face as a grinding stone to polish up the edges and take off the sharp corners. Do this by trying to saw through the brick face with the trowel edge at an angle of around 30 degrees. This can also be used to repair a trowel if you manage to put a nic in the polishing edge. Are you using a "Derby" to finish off with?. I've never used a "Derby", but I think it's for creating a flat scratch coat (which I do with a straight edged piece of timber), not for polishing finish coat. -- Andrew Gabriel |
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Plastering - How to get a better finish ?
"Andrew Gabriel" wrote in message ... In article , tarquinlinbin writes: On Tue, 29 Jun 2004 09:33:19 +0100, "Red Devil" wrote: Just had another go at plastering a wall at the weekend. In general things went ok, thanks to all the tips that I have picked up from this Newsgroup, but I think that I can do better with the final finish. When I use large sweeping arc movements , I tend to leave what look like tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? I'm not sure I know what you mean. If you mean vibration marks, that often happens. When you have finished they can be very visible, but if you polished off correctly, you won't be able to feel them at all, so they should completely vanish when you decorate. Yes, I think they are vibration marks. They are difficult to remove Would I be better doing straight horizontal or vertical lines ? No. Maybe I am holding the trowel at the wrong angle. Should I hold the trowel as near as flat as possible to the wall ? No. You may not have wet the surface enough when polishing -- you should be dragging a small quantity of water along the surface with the trowel edge. This carries fine plaster particles which are broken off the peaks by the trowel edge and deposits them in any depressions, which is how the polishing works. Flick water over the surface with a large brush (or used a plant sprayer) before you draw the trowel across. I think I have not polished it enough. I was a bit knackered at that stage and only wet the wall in places where it didn't look to have a smooth finish. I gather from your comments that I need to wet the complete wall as I polish it. The trowel may be too new -- i.e. not worn in enough. Plastering is much easier using some rusty old used trowel you dig out of the garden shed (providing you can polish it up along the edges) than by using a new trowel. Traditionally, a plasterer would buy a new trowel and give it to a renderer for a few weeks to break it in and wear off the sharp corners, before taking it back and using it for real plasterwork. You can use a house brick with a good flat face as a grinding stone to polish up the edges and take off the sharp corners. Do this by trying to saw through the brick face with the trowel edge at an angle of around 30 degrees. This can also be used to repair a trowel if you manage to put a nic in the polishing edge. Sometimes when I make a large sweeps I accidentally dig the corner of the trowel into the plaster as I nearing the end of the sweep. I think that I should have bought a slightly shorter trowel for practicing. Should I try to take the off the sharp rectangular corner ie make it more round ? The sides of the trowel are very sharp. I managed to put a nice nick in my finger when hastily cleaning it. Are you using a "Derby" to finish off with?. I've never used a "Derby", but I think it's for creating a flat scratch coat (which I do with a straight edged piece of timber), not for polishing finish coat. -- Andrew Gabriel |
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Plastering - How to get a better finish ?
"Red Devil" wrote in message
I think I have not polished it enough. I was a bit knackered at that stage and only wet the wall in places where it didn't look to have a smooth finish. I gather from your comments that I need to wet the complete wall as I polish it. Don't sweat it, the finished job can be repaired with some polyfiller. The main thing is you had a go and it turned out OK. You were not expecting perfection first time were you? How did you get on with the maid ravishing? If you reckon to go over a wall with six trowellings you will find the last stage works the magic getting all those bumps out. Twice when you put the finish on, twice when you get the air bubbles out and twice when you polish it. Sometimes when I make a large sweeps I accidentally dig the corner of the trowel into the plaster as I nearing the end of the sweep. I think that I should have bought a slightly shorter trowel for practicing. Should I try to take the off the sharp rectangular corner ie make it more round ? You just keep on as you are. The problem was in the newness of both you and the trowel. Next time eh? As you sweep over the wall the arc you describe covers most of the previous sweep the next covers most of your last and so on. In this way each blemish is worked out and smoothed away. -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Plastering - How to get a better finish ?
"Michael Mcneil" wrote in message news:859de07e5f05e9c1e4cdb7a905120a60.45219@mygate .mailgate.org... "Red Devil" wrote in message I think I have not polished it enough. I was a bit knackered at that stage and only wet the wall in places where it didn't look to have a smooth finish. I gather from your comments that I need to wet the complete wall as I polish it. Don't sweat it, the finished job can be repaired with some polyfiller. The main thing is you had a go and it turned out OK. You were not expecting perfection first time were you? How did you get on with the maid ravishing? I looked at B&Q for one ot those maids that you mentioned, but they were out of stock !!! I am getting plenty of practise (Not maid ravishing !!) as I have done quite a bit of patching on the walls with bonding, and now putting two coats of plaster on each wall. I might even be brave enough to tackle a ceiling one day.. If you reckon to go over a wall with six trowellings you will find the last stage works the magic getting all those bumps out. Twice when you put the finish on, twice when you get the air bubbles out and twice when you polish it. I will definitely have arms like popeye when I am finished. Six trowellings - that's a fair few cups ot tea... As they say "practice makes perfect" Better tackle another wall then !! Sometimes when I make a large sweeps I accidentally dig the corner of the trowel into the plaster as I nearing the end of the sweep. I think that I should have bought a slightly shorter trowel for practicing. Should I try to take the off the sharp rectangular corner ie make it more round ? You just keep on as you are. The problem was in the newness of both you and the trowel. Next time eh? As you sweep over the wall the arc you describe covers most of the previous sweep the next covers most of your last and so on. In this way each blemish is worked out and smoothed away. -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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Plastering - How to get a better finish ?
"Red Devil" wrote in message ... I looked at B&Q for one ot those maids that you mentioned, but they were out of stock !!! I am getting plenty of practise (Not maid ravishing !!) as I have done quite a bit of patching on the walls with bonding, and now putting two coats of plaster on each wall. I might even be brave enough to tackle a ceiling one day.. Strangely enough I found the ceiling easier than the walls. I did a plastering evening class and we did ceilings after a few weeks of walls. A couple of things to watch out for though - try and have some long planks to plaster from - it really helps to be able to move without having to keep moving stepladders - and wear glasses! Halfway through my first ceiling a I dropped a great lump in my eye. Cue rush to sink to rinse out and then a very red/scratched eye for a few days. Mark |
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Plastering - How to get a better finish ?
"Mark Walters" wrote in message ... "Red Devil" wrote in message ... I might even be brave enough to tackle a ceiling one day.. Strangely enough I found the ceiling easier than the walls. I did a plastering evening class and we did ceilings after a few weeks of walls. A couple of things to watch out for though - try and have some long planks to plaster from - it really helps to be able to move without having to keep moving stepladders - and wear glasses! Halfway through my first ceiling a I dropped a great lump in my eye. Cue rush to sink to rinse out and then a very red/scratched eye for a few days. Mark Mark Goods news if you found ceilings easier than walls. How long did your course last ? I presume that 1 coat would be enough on plasterboard. ? Do you use Board Finish or MultiFinish for ceilings ? Somebody suggested using MultiFinish as it takes longer to go off I am using planks for the top of the walls as it is too much hassle moving stepladders. I haven't managed to get it in my eyes yet, but it seems to have gone just about every where else!! Con |
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Plastering - How to get a better finish ?
On Tue, 29 Jun 2004 15:06:21 +0100, "Red Devil"
wrote: I looked at B&Q for one ot those maids that you mentioned, but they were out of stock !!! Even when they have any have you seen the price? -- Peter Parry. http://www.wpp.ltd.uk/ |
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Plastering - How to get a better finish ?
When I use large sweeping arc movements , I tend to leave what look like
tiny fold marks at the beginning or end of the sweep Is this due to the speed factor, eg moving too slowly when starting and finishing the sweep ? or is it trowel movement ? I suspect that your last trowelling is being done too early. Wait until the mortar has gone off a bit more so there is plenty of resistance to your trowel then spray with water before each stroke to provide a slippery surface. Press hard. Then run a damp paintbrush over the surface. That will remove any shinily overtrowelled areas and stop the decorator cursing you later Anna ~~ Anna Kettle, Suffolk, England |""""| ~ Plaster conservation and lime plaster repair / ^^ \ // Freehand modelling in lime: overmantels, pargeting etc |____| www.kettlenet.co.uk 01359 230642 |
#12
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Plastering - How to get a better finish ?
With redards to the arc sweeping motion. I understand that the
trailing edge of the trowel is in contact with the plaster as your arm goes up but what edge is in contact with the plaster on the way down? |
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Plastering - How to get a better finish ?
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Plastering - How to get a better finish ?
In article ,
Peter Parry wrote: On Tue, 29 Jun 2004 15:06:21 +0100, "Red Devil" wrote: I looked at B&Q for one ot those maids that you mentioned, but they were out of stock !!! Even when they have any have you seen the price? Sure - but the returns policy is very good. Just keep swapping them till you get a good one. Never ask for spares though... Darren |
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Plastering - How to get a better finish ?
In message , Eric
Cartman writes With redards to the arc sweeping motion. I understand that the trailing edge of the trowel is in contact with the plaster as your arm goes up but what edge is in contact with the plaster on the way down? Always the trailing edge -- geoff |
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Plastering - How to get a better finish ?
"raden" wrote in message ... In message , Eric Cartman writes With redards to the arc sweeping motion. I understand that the trailing edge of the trowel is in contact with the plaster as your arm goes up but what edge is in contact with the plaster on the way down? Always the trailing edge I thought on way down it was neither - i.e. don't go down, always up or across ? |
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