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dude, those look really cool. Did you shape those by sanding down a bigger foam block?
IMO you will want to fiberglass them first. Bondo is really more of a surface prep, and not designed to be structural. It's very brittle and I suspect if you just layer bondo over the aluminum foil you will find it cracking like an eggshell and then flaking off. If you do a layer or two of glass this will give it some structural rigidity and the bondo can be used to smooth it for paint prep.
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