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Hydroshrink 400 is a unique single component, Flexible, 100% solids (contains no V.O.C.), polyurethane elastomeric compound. Hydroshrink 400, when fully cured provides for simple method for reducing three dimensionally molded parts. Reduction of parts is done by simply molding the part with Hydroshrink 400 to form a rubber master. After curing 30 minutes at room temperature the molded Hydroshrink 400 part is removed from the mold and allowed to shrink at room temperature. Reductions from 55 % to 86% the original part can be made depending on how much water is added in the initial curing process.