Smooth-On Oomoo 25 2 Pint Kit (contains 1 pint of part A and 1 pint of Part B) OOMOO Silicone Rubber - No Scale or Vacuum Chamber Required. OOMOO 25 is an easy to use silicone rubber compound that features a convenient one-to-one by volume mix ratio (no scale necessary). This silicone is easy to work with and has a very low viscosity for easy mixing and pouring. Vacuum degassing is usually not necessary. Takes excellent detail. Cures at room temperature with negligible shrinkage and good tear strength. OOMOO 25 features a 15-minute pot life and 75 minute cure time. OOMOO 25 & 30 are suitable for a variety of art-related and industrial applications including making molds for sculpture and prototype reproduction, casting plaster, resins and wax. Tin cure silicone. Cures to an opaque blue-lavendar. Tip: *Do not cast platinum cure silicone into Oomoo silicone or any other tin cure silicone*