I have a very ugly tile floor in the entrance way of my home. It's in great shape and because it is so ugly it will last forever. I'd like to try to paint these. I plan to tape the grout lines, sand the tile, apply primer, and then do a faux finish in the colours that I like. My question? Will the paint come off? Will it stay forever? What kind of paint? What kind of primer? Help! Thanks so much.