I have to agree with what other reviews have said. In some packages, the product may be old? It's on the dry side and somewhat difficult to soften and harden. I had 2 packs, 1 was a bit dry (I opened the numbers first). The second was great. It was wet, easy to handle and left marks on my hands. Very sticky. It also changed color since the instructions said it would work when cured. The first not.