Liquid mold rubbers and casting plastics are used extensively in the reproduction of figurative sculpture. Original pieces are most often sculpted/carved from clay, wax or wood and a rubber mold is poured, brushed or sprayed onto this original to capture all detail and to allow flexible demolding from undercuts and negative draft.
A variety of casting materials can be poured directly into these rubber molds, including wax, plastics, plaster and concrete. Casting plastics can be a very versatile medium for the reproduction of sculpture as they readily accept fillers (e.g., bronze powder for cold cast bronze) and dyes that help to produce unique looks. Depending on the mold material selected, a release agent may or may not be required for the casting process.
For foundry applications, this rubber mold is one step in the lost wax process that ultimately creates a mold capable of accepting the heat of molten metals and alloys (e.g., bronze).