Self-hardening, 2 part product (A & B) must be mixed thoroughly. Putty like feel. * Open working time about 2-3 hours. Cures hard overnight (24 hour full cure). * Product Features * Self-hardening, 2 part product (A & B) must be mixed thoroughly. Putty like feel. * Open working time about 2-3 hours. Cures hard overnight (24 hour full cure). * 0% shrinkage. * Strongly adheres to almost any clean surface . . . including ceramic, fiberglass, foam, glass, metal, plastics, resin, stone, wood, and more. * User friendly clay. Non-flammable, non-hazardous. No solvents or fumes. Conforms to ASTM D.4236. * Strongly adheres to almost any clean surface . . . including ceramic, fiberglass, foam, glass, metal, plastics, resin, stone, wood, and more.