Hi, I'm a relative newbie here so go easy on me. I purchased a silicon sculpt of a han in carbonite type prop and when I lay it flat the face caves in. I'm new to working with this material so can anyone recommend a product that I could fill in the back of the sculpture to ensure the face stays three dimensional. I'm thinking that there must be some sort of light weight foam or even a resin product that would not damage the silicone.
Any help would be greatly appreciated.