Poly 74-40 is a 2A:1B mix, A~40 hardness, polyurethane liquid rubber that cures in 16-24 hours and is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete and resins (polyurethane, polyester, epoxy - with proper release agents). Poly 74-40 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener or fumed silica. Poly 74-40 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting. Poly 74-40 is very popular for casting plaster molds and dyes for hobby ceramic applications.

Poly 74-40 is a 2A:1B mix, A~40 hardness, polyurethane liquid rubber that cures in 16-24 hours and is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete and resins (polyurethane, polyester, epoxy - with proper release agents). Poly 74-40 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener or fumed silica. Poly 74-40 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting. Poly 74-40 is very popular for casting plaster molds and dyes for hobby ceramic applications.

Poly 74-40 is a 2A:1B mix, A~40 hardness, polyurethane liquid rubber that cures in 16-24 hours and is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete and resins (polyurethane, polyester, epoxy - with proper release agents). Poly 74-40 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener or fumed silica. Poly 74-40 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting. Poly 74-40 is very popular for casting plaster molds and dyes for hobby ceramic applications.