Hey all, I have used RTV rubber from the www.contenti.com for 15
years now. I never had to take any special storage precautions or had
the material go funny on me over many years of using the molds. It as
0% shrinkage and cures overnight. No oily discharge or anything else
I’ve heard described in this thread. I just pull them off the shelf
when I need to and they aleays work great. White metal can also be
cast in this rubber.
Contenti’s item number is 179-050 for 1 lb, 179-055 for 50 lbs.