Linda so the resulting rubber compound is creating a flexible non-stick mold? As long as you have a mold that the GTEE will not stick to, it would work. Probably plastic candy molds and Sculpey push-molds. Maybe other molds if they are coated with a release agant like silicone spray (WD-40).
I bet you could get the same type of stuff (like a dental alginate) from Dental supply place or a place that sells model-making supplies, but I don't know how the cost compares. I think the dental alginate runs about $6 a lb.

HTH, Karen

Thanks Karen, What I bought was 2 containers about the size of a petrie dish for 16.00. I want to make more molds and this dental product sounds just like what I need. Linda

Holy smokes, Linda! That's a little expensive! Do a google search for the alginate if you need to buy online- it isn't hard to find. Hmmm...maybe I'll get some, too.

Karen