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HydroSpan 100 is a unique two component, Flexible, 100% solids (contains no V.O.C.), polyurethane elastomeric compound. HydroSpan 100, when fully cured provides a simple method for expanding three dimensionally molded parts. Expanding parts is done by simply molding the part with HydroSpan 100 to from a rubber master. After curing 24 hours at room temperature the molded HydroSpan 100 part is soaked in room temperature water and allowed to expand. Full expansion is 161% larger than the original part. Full expansion of parts can be achieved in 5 to 14 days depending on cross section thickness of the part. Thicker cross sections take longer while thinner cross sections require less time.