I don't know how many of you guys have tried using this clay epoxy before, but has anyone had any luck using it as reinforcement and getting it to stick to most plastic surfaces? It was my original plan to use this for my cast, and I had heard that if you used plastic cement and coated it over the surface right before laying down the clay, it would break down the surface enough to allow the clay to adhere better. However, I'm now getting the impression that my polyurethane helmet will not "melt" with the plastic cement. And I'm unsure if my attempts to sand and scuff it up will truly help in the long run.
So I'm wondering if this product will end up being useful or if I should go another route. I was also wondering if it would help if I happened to stick on something that's perhaps more pourous to get the clay epoxy to grab onto? Any ideas?