Was planning on a nice easy week. We have just finished second room today bit of bonding and skimming. Both rooms have been a struggle. Each hit starts well couple of coats on and rubbing up quite the thing and then the plaster starts going weird! It starts to patch up as if drying but seems greasy to touch. It tears in places and we are unable to get a decent shine on it. I am sure it will paint up OK just doesn't really look as good as usual. Anyone know what it might be? It has happened to me a couple of times before