I returned this product to the Seller because it is absolute rubbish. They agreed with me and agreed to instruct their outlets not to sell it. It seems that they have changed their mind and still sell this pathetic product that clearly does not work. it does not set (ie does not harden) and remains soft and crumbly. It is as useful as playdough. I had to give one star because they would not accept my review without at least one star. Do not buy this product.