What should I use to prime an old plaster wall before skim-coating with new plaster?

Question

Should I use oil-based primer on an old plaster wall (as a bonding agent) before skim-coating new plaster over it?

score 2 · Answer 1 · answered Apr 02 '12 at 14:52

2

No, use a weak solution of PVA in water (5 parts water to 1 part PVA) instead.

Paint the wall with this and leave to dry, then re-skim.

answered Apr 02 '12 at 14:52

ChrisF

I understood PVA was used to prime drywall. Is this also used for plaster walls? – RET Apr 02 '12 at 15:42
@RET You can use on old plaster too. We had the kitchen ceiling reskimmed and the plasterer used it, and we've used it to seal a bedroom ceiling before papering it. – ChrisF Apr 02 '12 at 16:19
@ChrisF does it matter if the old plaster is premix or setting type plaster? – jiggunjer May 21 '15 at 18:46

1 Answers1