Renovating a bathroom in a 1920's house, which had a 1970's re-do, I pulled off the paneling and found the original tile, 95% in good shape. Question is what to do about the small holes in the remaining 5% of the tiles. I'd like to fill them with some material that can be painted to match (as best as possible) the color of the tiles. Any suggestions on filler material and paint type?