We have a recurrent problem with peeling interior wall paint in one of the bedrooms (in old brick colonial house that breezes all too well). This bedroom has three exposed walls (is the coldest room in winter and the hottest/most humid room in summer) and door towards the deck above garage. When we bought the house, walls were painted and did not seem to have peeling problem. There were cracks in the corners and we wanted different color for the room, so we decided to repaint. My contractor repainted last summer and on the surface everything looked ok, except he did complain that it was a difficult job since paint kept coming off. Then we had a problem of water from radiators flashing on the wall (no visible moisture damage, only walls looked bit dirty . A year later, we decided to repaint the corner which was exposed to dirty water. After repainting (without primer), paint kept peeling off in various random places (not everywhere, but also not localized at previous area exposed to moisture, or near windows) or appeared cracked, but still attached ("alligator" look). We scraped the loose paint (surface was cleaned well), patched, sanded, primed entire room (so far everything looked good), repainted. After repainting, the same result--paint peels off at places and has "cracked" look in other places (possibly the places that were not affected previously. I would like to avoid using oil-based primer because I and my young son sleeps close to this bedroom. Someone suggested to put a thin drywall over the existing walls, but I think if the moisture from exterior (walls are brick) is causing peeling, eventually it will get through the drywall as well. How to solve this problem? Do I need to tackle possible moisture problem? How to block moisture ...could I use paintable moisture barrier that one uses in bathrooms under ceramic tile? Could I glue on special wallpaper, then paint it (common way to reduce cracks in painted walls in Europe in old houses)? Walls are plaster and they may have had a wallpaper once, it maybe that the glue was not properly washed off...but after so many coats of paint, I don't see how I can get to that glue. I need a guaranteed solution as I can't stand redoing this room any more. Many thanks for any advice or insight.