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FAQ & Problem Solving I’m Having Trouble with Quick-Sil® There are two problems that new users sometimes have with Castaldo® QuickSil 2 – part RTV putty silicone molding rubber. The rubber may not become firm after the 15-minute cure time. Or the rubber becomes firm but the outside surface remains sticky and soft. Both complaints are […]

FAQ & Problem Solving My Liquid Rubber Molds Become Soft & Unusable! Molds made of CASTALDO® LiquaCast® 0% shrinkage RTV molding rubber and similar compounds will last 2 to 4 years if properly stored away from heat, light and humidity. Exposure to atmospheric humidity will soften these molds and make them unusable. Molds made of

FAQ & Problem Solving Why Won’t My LiquaCast® Mold Harden? Castaldo LiquaCast RTV jewelry molding rubber WILL CURE if the proportions have been mixed properly and cure temperatures are correct. Unlike traditional silicone rubber molding materials which allow wide latitude in mixing proportions, the proportions of LiquaCast Part A & Part B must be MEASURED PRECISELY. Proportions cannot

FAQ & Problem Solving I Can’t Remove Bits of Rubber Stuck Behind Stones After Mold-making. If pieces of Castaldo® jewelry molding rubber become stuck behind stones in a metal model, the following techniques can be used to remove them. First, try to dislodge the rubber with tweezers, a pick or similar tool. If that does

FAQ & Problem Solving How to Test Your Vulcanizer Most of the problems that jewelry mold makers experience with vulcanizing natural and silicone rubbers are the result of faulty or improperly set vulcanizing presses. If the temperature is too low the mold will not cure properly and will remain soft, gummy and easily deformed. If

FAQ & Problem Solving Mold Making – Guide to Solving Common Mold Making Problems Mold Cutting A cold mold is somewhat harder to cut than a warm one. Change knife blades frequently. Blades will cut more easily if dipped occasionally in a solution of water and liquid household detergent. Dull blades are hard to cut