I started to lay tile in the bathroon around the tub area walls. I ended up breaking a tile when I screwed the water spout back on and just noticed it this morning. I decided to take the tile off becuase it was still somewhat wet/dry. I ended up taking off part of the plaster wall. Actually to be precise I took off about 1/8 inch of plaster skim coat that was sitting on top of the plaster. Now I have bare plaster and need to put the tile back on. But my problem is I don't know if the bare plaster should be treated with something to withstand moisture. I heard that plaster of Paris would do the trick. There no way I can re-do the whole way with new sheetboard. The whole bathroom wall around the tub is all tiled. I am wondering what to do. Can I just tile over the old plaster? The old plaster is hard, but if I scrape it, it will turn sandy and be brittle. I have about 1/2 - 3/4 inch of thickness for the wall and the old plaster is covered with an old wire mesh. I was also thinking that oil paint will seal it. Maybe I don't have to seal it.
Take a look for a better idea.
I also need to back the pipe that is sticking out of the wall but it is in there really tight and I will mess the threads up if I grip it with a pipe wrench. Any ideas on how to get this out. I already sprayed it with wd-40. I need about another 1/4 inch from the wall so when I screw the spout back on it doesn't crack the tile again.
Any advice?