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i've got a great car-audio mag that talks about using that foam to make really good molds and forms for use with fiberglass.
I'll see if I can find it, it should be pretty helpful.
basically you would lay down trash bags in the area you want to mold, apply the foam then use an exacto to cut and shape the foam to what you want. i'll try to find out the actual name of the foam they used too
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