PermaStone is the ideal casting compound when permanent, break-resistant castings are desired. It handles like plaster and has a stone-like finish. ACTÍVA PermaStone mixes easily with water and reproduces the finest detail. If it happens to break the fracture is clean and easily glued/fixed. As it dries white, it can be painted with acrylics, oils, watercolors, tempera or any other finish! PermaStone is microwavable, non-toxic, and water resistant. Each bag includes 48 oz. of PermaStone. Sold as 2 bags.. Produces a marble smooth finish. Infinitely stronger than typical plaster. Break resistant. Perfect for outdoor use. 6+ years. Grade 1+