It’s all in the prep work! The first thing you must do to paint bathroom tile is to make sure the tile and grout are clean and free from any oils, dust or soap residue. The next step is to apply a good tile primer to dry tiles. When the primer is dry (read manufacturer’s instructions), lightly sand the tiles with a fine grit sandpaper. Remove all dust from sanding, apply another coat of primer, sand and wipe down again. Now you are ready to paint your tile!