I stripped back the ceiling paper in one of the rooms in our new house we are decorating, and the plaster is old lime & horsehair. The house is 1940s. The ceiling is in good condition apart from a few hair line cracks. Obviously the plaster is old so I guess that's to be expected. I was wondering how safe the plaster is expected to be if it has hair line cracks? As I say it's in good condition apart from that, but we'd ideally like to paint over it now the paper is off. I just don't know whether it's going to be a problem later in down the line. Cheers.