best material for molding polystyrene
I'm melting Styrofoam w/ acetone and wanting to put the goop in a gear mold; however I'm not sure what material I should be using for the mold. I was originally going to do it in ABS plastic, but wasn't sure if the polystyrene would glue itself to the mold as the acetone evaporates. So I was thinking of aluminum or possibly stainless steel. Your thoughts?