I can say that I used two part epoxy that is designed for crafts. I don't want to say anything bad about these epoxies, just wondered what persons that do blank casting thought. I initially purchased Cookey clear epoxy resin kit on amazon for just doing coasters. The epoxy is a 1 to 1 ratio. The blanks I made from the left-over epoxy seemed to cast well and turn without a problem. I did use a pressure pot after pouring, at about 50 PSI. My intent was not to start pouring blanks from this type epoxy, but it did work. What can be the draw-backs from using this type epoxy, rather than most of the stated casting mediums I see here? I understand that even Alumilite has many differant forulations, depending on what you're doing, or want. I don't plan on getting to full swing casting, I just do it once in a while for fun. I was given some English walnuts by a neighbor that has a ranch that grows them. I made a walnut shell pen for Him and his wife from the walnuts He gave me. I used the left over epoxy I had. They seemed to turn out well. They liked them anyway.