1:1 by weight addition cure molding putty silicone flexible and durable. Working time 20min; Demolding/Cure Time: 4H; Shore 25 ShA. High detail and flexibility; with built-in release agent (for high detail and more adherence on non-porous surfaces such as plastic or metals, we suggest removing the built-in silicone oil release agent, dry with absorbent paper); developed for restoration and vertical application. We suggest using 100 + 100gr at least. Avoid sulpher-based modeling clays, latex products and tin-cure silicone near the putty, avoid contamination of part A with part B while working with it. Introduction to Silicon Mold-Making