Dry Wall Lift
New plaster walls, sealed, but paint cracking & lifting off. Any ideas?
the plaster was completely dry before sealing with a proprietory sealant & when that ran out with pva diluted as per instructions. Put on a thin base coat of paint which has flaked/lifted up in certain areas. Where the base coat stayed ok & I added a second coat of paint there has been some further cracking in new areas. Wits end reached.
You been listening to people who don't know what they're talking about.
Under normal circumstances you do not seal, PVA or use specialist primer on new plaster you are going to paint. You simply use three coats of water-based emulsion - the first coat thinned (mist) to soak in a little and grab the plaster, that is the primer. I and other 'qualified' decorators have been taught that way in college and been doing it that way for decades - I also worked as the decorating advisor in a decorators merchants.
When you use PVA or another sealer you stop the emulsion primer being able to soak in. If you use any oil-based sealer you suffocate the p[aster. If your walls were rendered and skimmed then you use an emulsion that has no vinyl to allow the walls to continue drying out (can take 12-18 months) after this or if your walls just had a skim coat, then vinyl matt is fine.
If you want to do something useful before painting new plaster wash it down with clean water to get rid of any powdery residue that can act as a barrier between your paint and the plaster and if you have time brush your first coat of thinned primer emulsion on, working it in to get under any powdery residue.
In very exceptional circumstances, like a plasterer has over polished the finish or you don't want to take any chances, then you can apply a specialist primer like Bullseye 123 which is expensive and will adhere to the plaster.
Without seeing your walls I can't tell how far you have to go with rectification. If its patches then use a palm sander with P100 grit (or elbow grease with P120) to get back to what feels like a solid surface and wash any powdery residue off. Then recoat with emulsion. Allow plenty of time now between coats as you already have lots still hardening underneath. Good luck.
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