Oomoo 30 from Smooth-On is an easy to use tin cure silicone rubber compound. Suitable for a variety of industrial and art related applications, Oomoo 30 can be used for making molds for sculpture & prototype reproduction and casting plaster, resins, and wax. Perfect for beginners, this low viscosity silicone rubber is easily mixed and poured, and requires no vacuum degassing or scale for measuring. Mix ratio is 1A:1B by volume with a pot life of 15 minutes and a 75 minute cure time.