I have been redecorating hall stairs and landing with a matt emulsion paint. This paint drives me crazy, it is nothig like the paint of 15 years ago, which is on the walls of a cupboard in the hall and which I can wash (nay scrub) without it coming off. The modern paint comes off with a mere damp wipe, and shows very patchy where the light from the landing window shines sideways onto the stairs. I have tried painting this with brushes of different kinds, a roller, and still it makes no difference, and if I try to paint over a bad patch it looks like a hole in the wall. Has the paint really deteriorated in quality over the years, or am I doing something wrong? I have never had this happen before in all my years od decorating. aaaarrhhh....