Rock hard. Plastic repair material in powder form; to be mixed with water. Will not shrink. Can be used on walls, floors, furniture, woodwork or plaster. Hardens in 30 minutes. Can be colored or painted. Size: 1 lb, Container Type: Can, Type: Powder Related Products:RHWP4: Size: 4 lb, Container Type: Can, Type: Powder RHWP25: Size: 25 lb, Container Type: Drum, Type: Powder