I have a very uneven and cracked ceiling in my bathroom that I would like to be smooth - what do I need to do? The previous owners of my flat have attempted to cover it over with artex or textured paint and further coats of emulsion but it looks terrible. I want to avoid getting a plasterer involved and I've noticed several products on the market that claim to smooth over uneven walls/ceilings. Can these be used straight onto emulsion and how easy are they to use? cheers.