Polytek Platsil Gel 10 Platinum Silicone 2 Lb Kit PlatSil Gel-10 Platinum Silicone 2 lb Kit Easy 1A:1B mix, liquid platinum silicone rubber 5-6 minute working time. 30-minute demold time Shore A10 hardness Used as a mold rubber, for prosthetic appliances, and lifecasting!