I have scary green ceramic tile walls 3 ft up on 3 walls of my bathroom. Excluding the shower surround which I can live with or at least hide with my shower curtain, I need to know if I opt for covering it with beadboard or something like that must I use some sort of backing. I ask this because of all the sweating or condensation or whatever it is that accumulates on the ceramic now and the fear of warp and mildew. Similar question for kithen ceramic counter (which I do not abuse with hot pots or knives) and backsplash. Can I paint them and if so what products are suggested.