Dear Gregg, Nick, Jay and Paleo,
Thank you for your advice. I guess I need to do a little honest
research before I waste everybody’s time here. This is the first I’ve
heard about using a mica powder for separation. So I’m guessing the
process is that you mush the rubber up agaist one side of your part,
sprinkle powder on part and rubber, then mush new rubber on the other
side, enclose and heat? I better try to learn more about this from
Rio or some book. If anyone knows a good up-to-date book on making
great molds, I’d love to buy it.
I’ve always vacuumed the silicone I use, poured it into a mold
cavity surrounding the part, then cut the mold afterward with a
zigsaw cut to guarantee registration. It’s worked like a charm with
hardly any flashing.
I guess I just need harder rubber. I appreciate all the brands of
rubber recommended, and I’ll give them a try. Thank you!