The rubber cures by heat and humidity after being catalyzed. After 24 hours, if the rubber feels firm, remove the rubber mold from the pattern and let the rubber mold post cure for another two days before using. The extra post cure time will give you a longer mold life. The first casting out of the mold will probably have some of the mold release residue on it. SMS is applied when you need maximum amount of castings out of the mold, or to extend the life of an old mold that is about ready for the graveyard.
Instructions are on the container.
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