When you are figuring out how to paint tiles, it's a great relief to find that you do not need a kiln to do so. You will need to first wash the tiles with water and mild soap like dish detergent and dry. Next, apply a surface conditioner with a paint brush; this will allow you a few hours to apply the paint before it dries. In that time, use a dry brush to paint the tiles with enamel paint. The surface conditioner allows the paint to adhere to the tile. After the paint has completely dried, follow with a few coats of clear glaze.