How do you skim plaster over an existing (slightly damaged)plastered wall. I would guess the finishing plaster would have difficulty adhering to the existing 'polished' plaster. Do you have to roughen the plaster or coat with something like PVA? Ta Chris
Dilute PVA. Ideally plaster when the PVA is nearly dry but still slightly tacky. If the surface is quite absorbant, do two coats of PVA, the first even more dilute.
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