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it isn't always epoxy, there are other resins and binders in use. Epoxy is generally used in the home-manufactured parts because epoxy is not as stringent to control , less toxic, available, cheaper.
I just don't see anybody with a 4 ft x 4 ft x 4ft oven in their backyard to do exotics or ceramic.
remember when GM shaves a buck from each car they make, it is a multi million dollar annual profit.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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