Mold material can be picked up in Brighton at Reynolds Advanced Materials (the local distributor for Smooth-on) I was there today too. The stuff you want is called mold max 60, it's good for ~600 degrees so no worries about it deforming. $22 for a sample pack which would probably make a good 2 molds maybe more.
Best plastic I've ever found is from Chemionics, bears baits sells the stuff cheap online.
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