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Re: Front Bumper Option
car wax, cooking oil, all kinds of things can be used as a release wax, particularly if the finish of the mold side of the product is not too important and some swirls don't matter. For molding on outside of a bumper you could just stretch some plastic film or vaper barrier if you don't mind a wrinkle or ten.
I made a glove box insert in a sacrificial female cardboard mold and just lined it with packing tape, I was surprised how well it just popped off the packing tape and left a fairly smooth surface.
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