I want to make a hard and light weight mold with polyester resin and fiberglass, and cast platinum silicone in this mold.
But before i made many tests with different releasers and silicones, but there is a problem - when silicone cured, all surface (which contact with polyester resin) is slimy.
I saw how used polyester mud, or bondo-resin mix in your lessons to making molds, but i cant release those materials... (
p.s.: i attached photo of my character which i want cast in fiberglass mold, but because of my problem i cast it in silicone mold.