Some years back I had to make twenty-two life rafts. Made a small box out of stiff cardboard, filled it with silicone caulk, used a thin coat vaseline as a mould release and pressed a white metal raft into it. The vaseline was on the raft. After letting it cure, the master was popped out and the cavity filled with quick setting epoxy. Got all twenty two rafts and the mold was still useable. Maybe this would help.
Regards rjccjr
Can you use silly putty as a mold for casting small parts, such as merchant ship winches?
Bob Pink
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