We use 100% silicone mold material that does not stick to metal clay, or any other type of clay, so no release is needed. Molds can be placed on a heat source to dry clay. Safe to 500°F. Use molds to create a pendant, earrings or a focal point on a cuff. The photo shows a finished piece made from fine silver clay. It has been oxidized to give an antique appearance with Cool Tools Patina Gel.