Sculptamold is a dry, white, non-toxic compound that combines the best features of clay, plaster, and papier mache, does not shrink, and is durable for dioramas, 3-D sculptures, model railroad scenery and stage scenery. After shaking closed bag to thoroughly blend contents, add water to Sculptamold® as directed on bag and begin modeling. Sculptamold sets in 30 minutes, so prepare only as much as can be used in a half hour of modeling time. Sculptamold clings to almost all clean surfaces and can be applied to an armature or any core without fear of cracking. One 3lb/1.35kg bag of Sculptamold will make 141.75 cubic inches of solid material.