This extra-hard, toxicologically and physiologically harmless ceramic casting compound, mixed with phosphates and quality gypsum materials, is mixed with water to form a water-repellant, extremely hard and firmly curing molding compound. After curing, the casting absorbs no more moisture, is similar to a plastic article, but stronger and harder. Mixing: 1 part water to 4 parts Artestone (1:4). Curing time 30 minutes. Mechanical treatment should be done within 60 minutes after demolding, because the part will become even harder and firmer. Plastic Bucket.