The clay maquette is covered with silicone rubber. The rubber forms a mold of the original maquette, and preserves all
of the surface details of the original. When the rubber hardens, it is covered with an outer layer of Plaster of Paris. The plaster is rigid enough to support
the rubber and keep the mold from changing shape when the wax is poured in. When the plaster jacket is hard, the rubber and plaster are removed in two or more
sections, depending on the size of the sculpture.
The rubber mold is a "negative" version of the original. If more than one copy of the bronze is going to be made, several sets of
these molds can be made. They can be reused over and over to make more wax patterns.