Smooth-On has been making polysulfide rubber since World War II. Unlike other mold making materials, polysulfides are not bothered by sulfur or moisture present in many modeling clays favored by sculptors. They continue to be used by art bronze foundries and as an important part of the lost wax process. Tire mold makers like the fact that polysulfide can be altered using a hot knife to modify patterns quickly.
FMCTM Series
Very durable and will last for years in production casting of wax or gypsum. Ideal for those applications that require capturing intricate detail from a variety of model surfaces
