•Polyurethane and Polyester Resins– As mentioned in the previous section, silicone rubbers are generally the best option for casting these materials. Upwards of one hundred parts can be cast in these molds. If you only require 10-20 cast parts, then you might opt to use less-expensive polyurethane mold rubber.
•Mix 2 parts plaster to 1 part water. Do so by first pouring water into a mixing container, then add the plaster. Adding plaster to water will result in less clumps. There will still be clumps, so get your hands in there and squeeze the clumps away.
Answers & Comments
RELIEF MASTER OR MOLD;
Explanation:
•Polyurethane and Polyester Resins– As mentioned in the previous section, silicone rubbers are generally the best option for casting these materials. Upwards of one hundred parts can be cast in these molds. If you only require 10-20 cast parts, then you might opt to use less-expensive polyurethane mold rubber.
•Mix 2 parts plaster to 1 part water. Do so by first pouring water into a mixing container, then add the plaster. Adding plaster to water will result in less clumps. There will still be clumps, so get your hands in there and squeeze the clumps away.