Jumpy Guy
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| posted on 7/11/07 at 07:32 PM |
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DIY Question - painting
Had my bathroom ceiling re-plastered a week ago
We were midway through a second coat of emulsion last night, when a 5" section bubbled, and the paint fell off
the rest of it seems sound enough..
the plasterer suggested using some PVA adhesive in the next coat of emulsion
Does anyone know what ratio of PVA/paint/water?
or any other suggestions?
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Fatboy Dave
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| posted on 7/11/07 at 07:43 PM |
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I normally do it 50/50.
I never paint fresh plaster; it just sucks the moisture right out of the paint and it flakes like a bastard
Dave
Stop the planet, I want to get off
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DarrenW
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| posted on 7/11/07 at 07:44 PM |
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i used a good quality eclipse plaster sealing paint on mine. did a great job. The good stuff will blot out the raw plaster in one coat and give a good
base for the top coat.
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DarrenW
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| posted on 7/11/07 at 07:47 PM |
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Another point - each coat needs to be fully dry before painting over. Ive had a section lift and fall off when previous coat wasnt dry.
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Jumpy Guy
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| posted on 7/11/07 at 07:50 PM |
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if you say you never paint fresh plaster, then what do you do?
surely you dont have a house with lots of bare plaster?
not being funny, genuine question......
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DarrenW
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| posted on 7/11/07 at 08:00 PM |
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I think what Dave will be saying is that you dont apply a top coat straight onto fresh plaster. You can get special paint for sealing it off first. I
used
Macphersons Eclipse. Its very white and has great coverage. Also good for covering stains and nicotine etc (there are limits though - surface needs to
be as clean as poss).
Top coats and seal coats are based on different materials - cant remember what they are though off hand.
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Confused but excited.
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| posted on 7/11/07 at 08:02 PM |
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Michael Angelo always painted his while it was wet. Seems to have lasted OK. 
Tell them about the bent treacle edges!
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thunderace
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| posted on 7/11/07 at 08:03 PM |
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err i mix it 10 parts water to 1 part pva it will seal it .
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Jumpy Guy
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| posted on 7/11/07 at 08:03 PM |
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thanks guys
seems very strange that the plasterer never mentioned any special paint at all
"just water down the first coat of emulsion"
ah well, I'm 90% done, so its a bit late for special paint
i think another shot with some watered down paint......
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DarrenW
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| posted on 7/11/07 at 08:09 PM |
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Ive tried watering down the first coat, PVA ing first and using proper paint. Yes the chaeper options work to a point but ive had a far better result
using the correct paint. I also found that the cost wasnt much more when i found good trade place and less coats were needed / better overall result
found = much better job.
There will be hundreds who will say water down / diy mix your own etc but all i can say is that an old school decorator (in the trade for 58 years (14
to 72!!) and still going) showed me this way and result was great.
Sorry - i digress. Ref you patch - id let it dry fully, rub down the edges to feather in. Try the watered down PVA on raw bit, Let dry fully then
paint. Its surprising how watery a PVA mix can be and still work. Thin mix soaks in well and gives a good key.
[Edited on 7/11/07 by DarrenW]
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Fatboy Dave
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| posted on 7/11/07 at 08:22 PM |
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I leave it for six months, or in the case of walls that can't be left, anything up to a dozen sizing coats (watered down emulsion) will work.
Or, as you say, water/PVA mix. Still not a pretty job mind.
I hate painting after plastering.
Dave
Stop the planet, I want to get off
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DarrenW
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| posted on 7/11/07 at 08:46 PM |
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6 months or 12 sizing coats - WOW thats a lot. Mine dried far faster than that and took one coat to cover with Eclipse. I also hate decorating plaster
walls which is why i was happy when the old boy showed me the trade way, made it a lot easier (TBH i just paid him to do the whole house )
I guess like most things people have their own methods that work for them. None are essentially wrong if they end result is good.
[Edited on 7/11/07 by DarrenW]
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twybrow
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| posted on 8/11/07 at 09:48 AM |
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We had a similar problem in our bathroom. the plasterer left a mirror like finish to the plaster. We waited a few days for it to be visibly dry, then
painted with a watered down emulsion coat (50/50). Once dry, we then painted as normal. Probelm was, a bubble appeared and I tried work it back down -
big problem! It got bigger and bigger. In the end we solved the problem by using alarger mirror than we initially bought - problem solved!
I believe you can get 'new plaster emulsion' which allow moisture to come out of the plaster as ti dries (6 months apparently). I hope it
works out of for you.
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v8kid
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| posted on 8/11/07 at 09:50 AM |
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Another advantage to the specialist paints is they seal the plasterboard against moisture - a bit like a vapour barrier. Very advantagous in steamy
areas like bathrooms and kitchens. They also blank out any colour variation - patching etc.
Disadvantage is they are "sticky" and leave a slightly stippled effect from the roller.
God how I hated doing all that house building stuff I'm so glad it is all behind me now - you have my deepest sympathy.
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