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Using Silicone Rubber
Silicone Rubber Molding and Casting Material
Combine 10 parts base with 1 part activator by weight. Activator should be agitated before adding to the base. Activator is highly moisture sensitive. Keep sealed when not in use! Mix until uniform color is achieved.
When casting with silicone rubber over clay models, IT IS A MUST that you coat the clay model with shellac or P.V.A. This will seal in the sulfur found in most clays. If this step is omitted, the silicone rubber will not cure properly.
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