Free Form Sculpt Epoxy Putty - Trial Size A two part sculpt-able epoxy clay that requires no firing Will self-cure in a short time to an extremely hard and durable state with virtually no shrinkage. 30% lighter than similar products and holds vertical surfaces better. Easily colored by adding SO-Strong color tints to create marble or other effects. Cured putty is easily painted with acrylic paints. Does not contain crystalline silica (which is a known carcinogen)