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Andrew
Senior Member
Joined: 16 Aug 2006
Posts: 362
Location: Sunny Southend!
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 Posted: Thu Oct 25, 2007 12:15 pm Post subject: plaster & paint vs unibond |
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Right, can someone clear this up for me please:
One side...
I've been told & shown by a plasterer that when patching a repair you apply unibond around the immediate area to enable the feathering out of the repair (with the knowledge that there will remain an area of wall past the feathering where the new plaster won't cover but which remains unibonded). I've also been told by someone to unibond bare (but dry) plaster before misting and painting it. I've also read to seal flakey painted wall, you should unibond it.
Another side...
But I've also been told that unibond should go no-where near bear plaster, and even the side of the tub says you shouldn't use a water-based paint over it (I assume it becomes tacky again).
So what's the right angle on this??? 
I've posted this in the decorating section, but if it's more appropriate being in the plastering section, I'll happily move it. |
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paintycait
Senior Member
Joined: 21 Nov 2005
Posts: 300
Location: Scotland
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| Posted: Thu Oct 25, 2007 1:55 pm Post subject: |
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I would use it for priming your plaster patch but just don't use it to prime a new plaster wall...you are right, it is resoluble in water...it can bubble up as paint is drying, and cause untold problems of paint failure. For a long time PVA was touted as the solver of all decorating problems...which it isn't, it's a great product used correctly but used incorrectly you can open up a minefield of problems for yourself.
There are paints for new and old bare plaster and products suitable for flaky friable paint surfaces that are to be painted over...none of them are called PVA.
Here is the tech sheet..probably exactly what is on the back of the tub but anyway:
http://www.makingdiyeasier.co.uk/unibond/pdf/pva.pdf
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Welsh Decorator
Senior Member
Joined: 29 Sep 2007
Posts: 4068
Location: Cheshire
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| Posted: Thu Oct 25, 2007 8:51 pm Post subject: |
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On the repair side, yes use it, but dont go mad with it, only go a couple of inches on to the surrounding area, and patch while it is still soft, so that it will all but go with troweling up. 
Otherwise, as Paintycait has posted, it is NOT a cure all product, and in the decorating trade it can and does cause problems.  
Flakey walls, use the right stuff, after through preperation.
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Andrew
Senior Member
Joined: 16 Aug 2006
Posts: 362
Location: Sunny Southend!
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| Posted: Fri Oct 26, 2007 7:17 am Post subject: |
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| thanks both of you |
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