Hi, I'm remodeling my kitchen, and want to put subway tile as a backsplash/wainscot on two walls. The walls are old plaster/lathe with a gloss enamel paint. Can I adhere the tile directly to the plaster, perhaps using a deglosser first to take the paint down a bit? I don't want to add too much thickness by putting up cement board etc, since that will make the tile thicker than the window and door moldings. Or do I have to take down the plaster and put up cement board in its place? Thanks for any help with this.