Rubber Hammers in Prop Making Silicone Molds Polytek® materials can be used to create a variety of effects and objects including faux glass objects, brittle glass (PlatSil® SiliGlass), faux bronze objects, lightweight foam props, lifelike silicone props, security weapons Props, replicas of historical objects, scenery, and more. Once the original design has been created by the artist, it can be made from an original soft polyurethane or silicone mold or a rigid plastic mold. A variety of materials can then be cast in the finished mold, including plastic, foam, polyurethane and silicone casting rubber, plaster, concrete, and more. In some cases, foam engraving is hard-coated with a refractory plastic casing to provide a durable exterior finish that can be easily sprayed