Hey Tom, Use Allumilite High strength mold for your mold and make sure you dont get the quick stuff, this stuff is pink and takes 24 hrs to fully cure(really good detail and very flexible and strong), as far as casting i like SmoothCast 300 or 310. The only difference between the two is cure time. I think the 310 gives you 20 minutes of working time and the 300 only gives you 3 minutes.