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What is Cold Cast Bronze?

Cold cast bronze is another way to cast a bronze which doesn't involve a foundry. The pieces are first modelled in wax or clay. A silicon rubber mould is made from the master.

Instead of traditional bronze, cold cast bronze is in the form of a fine powder. This is mixed with resin and painted into the silicon mould and allowed to catalyse.

The mould is sealed and filled with resin. A sheet of lead is added to the final pour to add weight to the work. When the piece comes out of the mould it is sanded, the seams are filled with additional bronze resin and it is polished to bring the bronze to the surface

It is then given a patina and a final polish

Mould
First a mould is made... this is the plaster casing for the mould. The rubber is poured in the skin between the model piece and the plaster
  • First a mould is made... this is the plaster casing for the mould. The rubber is poured in the skin between the model piece and the plaster
  • Pouring the rubber from a height diminishes bubbles in the mould
  • This normally takes 24hrs to cure and then the other side is done. The clay plugs the air outlets to prevent cavities in the final mould
  • The bronze is real bronze but is in the form of a fine powder and is mixed with resin
  • The gel coat is painted into the mould and then the two halves are sealed together and then filled with more resin
  • This is the cast poured and allowed to catalyse.
  • The piece is taken out of the mould and seams are sanded and filled
  • Filling seams with more bronze. Once the piece is smooth and all defects are filled it is polished.