You know it makes sense! 
Painting new plaster
- Thread starter mika_98
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- 28 Oct 2005
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Plaster doesn't breath. It's dead. Contract matt is fine if that is your final coat. It isn't good as an undercoat. It's very chalky as it contains little binder. Ergo it doesn't adhere very well. When you put you top coat on it is much tougher than the contract matt which then becomes a weak sandwich between the plaster and the vinyl top coat. That often leads to the top coat peeling.
I personally use a sealer on the plastered walls as find it splashes less then a 50/50 mix but have used that in the past. its personal preference but as long as the plaster is sealed and does not draw the water out of the water based paint it will be ok.
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