Cast-a-Mold thixotropic additive is specifically formulated for brush on molding. After mixing the thixotropic additive 1-3% by weight into the Cast-A-Mold silicone rubber the material will thicken to a creamy paste that can be easily brushed on vertical or overhead surfaces without sagging or running. A thin layer of non-thixotropic silicone should be applied first to capture detail and achieve a bubble free surface.
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