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Polyester Resins
The purpose of the mother mold is to hold and protect the latex mold. It holds the shape and supports the latex while a mold is being made or stored. The seams in the mother mold should be precise. Otherwise, over time, the latex mold will eventually sag into the seams of the mother mold. Always store the latex mold in the mother mold.
All polyester resins consist of part A, which is the resin, and part B, which is the catalyst.
Polyester resins may also be used to cast into silicone rubber molds to obtain solid objects that are light in weight.
Polyester resins can be thinned, and cleaned up, with acetone.
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Cabosil is used as a thickening agent for urethanes, silicones and polyester resins.
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