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 and be altered using a hot knife to modify patterns quickly.
We are open. Smooth-On continues to manufacture and is maintaining normal levels of raw material / finished goods inventories. Considered an essential business as defined by CISA, we will continue to manufacture / ship materials during the COVID-19 epidemic. Smooth-On will be closed Fri Apr 10th in observance of Easter Weekend.