ZYP works a lot better if you have it available. Less chance of failure, less (if any) needling, etc. It is a little more expensive, but ruined texture molds can be expensive, too .
I recently wrote a tutorial for a way to use the GreenMan mold, if you are interested. This tutorial used the 7″, but you could certainly “go big” and use the larger one!
Jester’s Baubles Fused Glass Designs