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You need to undercoat the surface before coating it with an interior paint. Undercoat serves a couple of purposes: firstly is seals the surface so that later coats do not penetrate the substrate, in the case of tannin rich timbers it also prevents the tannins leaching out through the surface coat, secondly it provides a high level of adhesion for the surface coat so that it sticks properly. Not using an appropriate undercoat is the single biggest cause of poor paint performance.......
cheers
Gary
(and yes I do work in paints...)
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