Poly 74-Series polyurethane liquid mold rubbers are soft to mid-range hardness (Shore A20-A55), high-performance, room-temperature (RTV) curing systems. They offer superior flexibility and toughness allowing durable molds to be made from relatively simple to highly detailed, complex models. The 74-Series liquid mold rubbers are supplied as pourable liquids but can be easily thickened to make brush-on molds.
Plaster and wax can generally be cast in polyurethane molds without any release agent, but most concrete mixes and polyurethane resins require a suitable release agent (e.g., Pol-Ease® 2300 Release Agent).
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