UncleFista
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 posted on 17/7/09 at 01:20 PM |
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Painting over PVA
The cowboy who plastered my bathroom seems to have used PVA to seal the new plaster.
Since being painted (with emulsion) it cracked and flaked a bit in the corners. Today I thought I'd hoover the worst of it off and touch-up,
unfortunately, where the hoover nozzle touched, it sucked all the paint off the walls/ceiling ! 
Looks like I'll have to decorate again, at least the paint stripping will be easy 
What can I do to stop it peeling again ? Some type of barrier coat, sand the walls (please no !) any suggestions gratefully received 
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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tegwin
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| posted on 17/7/09 at 01:38 PM |
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Um.... stick some lining paper to the walls...then paint it?
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twybrow
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| posted on 17/7/09 at 01:43 PM |
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I'm no expert, but PVA is water soluble, so just wash all the walls really well with a mildly soapy solution. Once done, do a small test area
before painting everything. We had a similar problem in out bathroom- pain started peeling in the middle of the wall. the soltuion - we bought a
bigger mirror!
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Ray
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| posted on 17/7/09 at 01:44 PM |
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Hi you need to seal the plaster with PVA to seal it. also mix some up in your emulsion when putting it on works a treat
cheers Ray
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UncleFista
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| posted on 17/7/09 at 01:58 PM |
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quote:
Originally posted by Ray
Hi you need to seal the plaster with PVA to seal it. also mix some up in your emulsion when putting it on works a treat
cheers Ray
I've always sealed new plaster with watered down emulsion and I've never had any problems before.
It's possible to feel the PVA on the plaster, maybe he used too thich a mix, and it wasn't absorbed ?
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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thunderace
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| posted on 17/7/09 at 02:19 PM |
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you paint the wall with 1/10 pva then plaster the wall (pva it to help the plaster bond to the wall)
the plaster it may bleach through (the pva)mix more pva 1part pva to 10 parts water then paint the wall it will dry in clear and the flake pva will
wash in then paint the wall problem solved easy.
you cold just wash the walls it water based .
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andy o
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| posted on 17/7/09 at 03:26 PM |
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what he said ^^^
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Litemoth
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| posted on 17/7/09 at 03:59 PM |
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The not-so-great plasterer may have 'polished' the wall. That means he's left a shiny keyless finish on the wall that causes
peeling. It's a common problem if you're painting as it's only meant for papering onto.
Get some fine sandpaper or that 3M plastic sandy cloth stuff and quickly rub the walls to key the surface - its a fairly painless procedure and will
cure the problem. PVA on top of plaster in bathrooms isn't a great idea as it's broken down by water.
Try 'kitchen & bathroom' paints as they're better suited to wet environments.
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ibakes
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| posted on 17/7/09 at 04:15 PM |
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I can plaster and have done quite a few jobs, the most common problem I have heard from people is that they have never been told how to paint on to
fresh plaster.
Fresh plaster will dry the paint out too fast and cause it to flake off.
PVA is water soluble and can be painted over without any problem
You need to water down the first few coats of emulsion, start with a rough 50/50 mix, this will help to seal the wall and stop later coats of emulsion
drying out too fast.
keep making the mix stronger the more coats you put on to get the colour you need
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