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

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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.

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I understood PVA was used to prime drywall. Is this also used for plaster walls? – RET Apr 2 '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 2 '12 at 16:19
Thanks, Chris!!! – RET Apr 2 '12 at 16:24
@ChrisF does it matter if the old plaster is premix or setting type plaster? – jiggunjer May 21 '15 at 18:46

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