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Originally Posted by TedV
anyone drafting behind a car when the belly pan falls off probably prefers to run over plastic than a chunk of metal.
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If you attach anything with appropriate fasteners it won't fall off.
However sheet aluminum is hardly much thicker than paper - so you won't need fasteners anywhere near as long as you would with a thicker material. Also sheet aluminum can be bent and even shaped as needed, and it won't crack, break off or catch fire.
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The plastic isn't flimsy, my screws just weren't long enough
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That's why thinner material is better.
Of course some will always be in denial that there might be a more advantageous alternative than what are currently using because their egos are invested in it.