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whats a good material to extend the spoilers with?
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Polymetal/Alumapanel/MaxMetal. All are a 3mm plastic sheet with aluminum skins and an enameled finish.
These samples were sheared, braked and rolled on a bench tool with an 18" lever arm, by hand. The brake was least successful as it burst the ouside skin. Perhaps not if the inside is scored beforehand.
I think a big advantage is that it's pre-finished.