i'm in the middle of painting a large room (a shop) with dulux trade vinyl matt. the walls are victorian tonge and groove panelling, which have been sanded and primed. this was done a while ago and unfortunately i can't recall what was used to prime the boards. as i'm painting it small patches fail to stick and blister and when it dries these flake off. this has happened over a lot of the are, though some areas seem fine. anyone know whats causing this and what the remedy is?
(ps is vinyl matt the same as matt emulsion?)
thanks