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one thing about bondo is that its pretty thick isnt it? the best mold material for picking up detail is one that can take heat and is the most liquid when you pour it. take a look at Jewery investment materail. Jewlers use it to cast silver, gold, bronze, etc..Its basicly exactly like plaster of paris but can take thousands of degrees... you will have to dry it out in an oven before you cast into it though..if theres any moisture it might blow up in your face.
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