I just got a trial amount of Castaldo's Quick Sil mold-making
material. I want to make a two-part mold of a small fossil. I can't
tell from the directions how to insure that the two halves will
separate after curing. It is supposed to be self-lubricating,
needing no release agent. Here's the question: do I pack the
bottom half of the mold frame, press in the fossil, let it cure, and
then fill the rest of the mold frame and let IT cure - in two steps?
Or do I pack the bottom, add the fossil, and finish packing the
mold - all in one step? Do I need to use something as a separating
powder, like talc?
Thank you from New Mexico,