Natural latex molds, when properly cared for and handled, are quite durable. Sometimes they do tear however, and repairs are necessary. If the mold is in otherwise good shape and the damage is not too extensive, repairs can be simple and straightforward. Small tears may need very little work, but.
Repairing Polyurethane Rubber Molds. For polyurethane rubber molds, like Series, Series, and Polygel ® rubbers, the ideal option for repairing tears is PolyBond. PolyBond is a two-part, flexible, polyurethane adhesive that has a 1A: 3B mix ratio (by weight), a 3-minute pour time, and a .
Although both silicone and urethane rubber molds are considered durable enough for repeat castings, damage can occur over time. Sometimes a rubber mold will wear away in some sections, causing the walls to become thin, or you may accidentally tear the rubber when handling the mold. Repairing a rubber mold by patching the tear can be tricky.
Although a repair may not be permanent, you can repair either a silicone or urethane rubber mold so that you can at least get a few more castings. You can then use that a casting to make a new mold. Repairing a Silicone Mold. Use Sil-Poxy® silicone rubber adhesive. Important: all .