– A concentrated release oil to be mixed with 100% mineral spirits in order to create a tile mold release agent. Mix 4 oz. of Release Oil with 1 gallon of 100% mineral spirits. Rub a small amount on each mold using a cotton rag 10-15 minutes prior to pouring the tile admix into the mold. This will make it easier to remove the tiles from the molds. Do not leave tiles in the molds for more than 24 hours. The molds will peel off the tiles the easiest within 6-12 hours.