Brushable Silicone Mold Making Rubber, RTV Molding Rubber. Brushable for making thin wall "glove" molds. Clings to a vertical surface. Use petroleum jelly to separate silicone when using with glass and other silicones for the best results. Durometer 28. Pot life approx 30-45 minutes. Demold time 16-24 hours. 8.8 lb Kit NOTE: THIS PRODUCT IS NOT ELIGIBLE FOR AMAZON FREE SHIPPING.