the first layer of silicon has cured, I pour a supporting
mother mold of plaster. This step adds strength and saves
on silicon. I remove the clay and get ready to pour the other
half. To prep the first layer of silicon, I brush a mold release
on it. In this case I've used petroleum jelly. I just apply
it to the cured silicon, it's not neccesary to put it on the
wax because the silicon won't stick to that.
notice the little registration "nipples" (for lack
of a better name) in each corner. These were made in the clay
with a pencil before the first silicon pour.