High Strength RTV 2 Silicone is a great all purpose silicone as it is flexible, extremely tear resistant, has a low viscosity that does not require degassing (although always recommended if capable), and is very easy to mix. The High Strength RTV 2 silicone is a tin base silicone. It is recommended for one piece molds, molds with undercuts, multi piece molds, and molds that require a very high tear strength. Some of the materials you can cast into a silicone mold are: - Urethane Plastic - Urethane Rubber - Epoxy - Polyester - Fiberglass Resign - Plaster - Soap - Wax - Low melt metals (up to 400 degrees Max) - HydroCal White - UltraCal 30 - Rigid Foam - concrete statue mold