Overmolding with urethanes
RTV molding lends itself easily to insert molding or over molding. Two patterns are produced, one with the over mold and one without the over mold. Then, two rubber molds are produced, and the urethane is cast. The first part is cast into the rubber mold without the over mold. That part is then pulled from the mold and inserted into the rubber mold with the over mold. Then the over mold is cast around the existing cast part. Once that part is pulled, it has both materials cast to complete the two-part over mold

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