These two-part, liquid mold rubbers can be poured, brushed or sprayed to make molds that cure at room temperature for casting plaster, wax, concrete, resins (polyurethane, epoxy and polyester) as well as polyurethane foam. They are the most versatile, easy-to-use and cost-effective mold materials available. Hardnesses range from a soft Shore A-20 to a very firm Shore D-45.