Rubber molding with fiberglass back

Rubber mold (fiberglass)

Part of rubber mold with fiberglass outer mold

Rubber molding (fiberglass)

Designing mold sections before applying rubber

Who needs it:

Sculptors

What it is:

Molding with fiberglass back has its advantages. Mold breakage is extremely unusual.

The disadvantages: longer time to apply it and higher price.