Can someone please help. Last summer I decided to remove wall paper in my bedroom as i want to go back to painted plaster walls. I washed walls to remove paste. Gave 2 coats of mist coats then painted Dulux emulsion (2 coats). Now the paint has started to blow off the walls in areas. It appears to bubble up first then flake off in quite large areas. I have an old house - the walls are stone and about 2ft thick! This only appears (so far) to be happening on external cold walls. I have heard of breathable paint - what does this do and where would i buy it if needed? Can someone please advise - I am at my wits end. All my hard work ruined. It took me weeks to do. Please dont tell me to put wall paper back - i really dont want to. Please advise me.