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Plastering Question
Should i use pva on scatch coat (6.1.1), before i use a lime putty finish, or just dampen with water?? cheers...
PVA or water, been told told both way's by other plasterer's?
8 Answers
Best Answer
Lime plastering is a total different ball game to modern plastering, if you mean PVA modern cement and sand based render coat, its not the way to it should be a lime base coat...its no good just using lime putty it will just crack up even on the correct base coat....mix should be St.Astier NHL hydraulic lime mix with kiln dried sand 3 parts sand to one lime and a couple of trowels full of putty mixed for about half an hour....putty is normally only used for a lime wash mix...
Answered 26th Feb 2011
no way .never put pva on any scratch coat.
Answered 28th Feb 2011
just give a good wet down with water
Answered 26th Feb 2011
just spray some wother mate if u have watherproofer in the scratch coat
Answered 26th Feb 2011
don't use the pva,just dampen with water you should have no problems.
Answered 26th Feb 2011
As ppm said, just wet with water.
If you were using sand/cement and wall was porous I woulnt use pva, I would give it a coat of sbr slurry
Answered 26th Feb 2011
Water should be fine not pva or you will have problems
Answered 4th Feb 2017
wet down with water is fine
Answered 26th Feb 2011
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