Making A One Piece Cut Block Mold

The seam in the rubber mold is carefully aligned and pressed together and is held with large rubber bands. (You could also reassemble the mold box around the rubber to accomplish this.) Smooth-Cast 300 is carefully dispensed and mixed and the mold is filled and allowed to cure. After curing the rubber bands are removed and the casting is extracted from the mold. We chose to do another casting using Crystal Clear resin, with the added step of placing the entire mold into a pressure chamber after pouring. The chamber is pressurized to 60 PSI to eliminate bubbles in the casting resin. After the cure time has elapsed, the chamber pressure is released, and the mold removed. The perfectly clear casting is then extracted from the mold.