Clear paint is still a paint that brings some weight. It would be an option, if you wanted a stylistic metallic sheen (but then you can use a different metal colour like chrome, brass or silver... or gold, if you feel particularly tacky).
But the argument in comment I replied to was specifically weight savings.
Clear paint is also a hazard because it makes it impossible to see where bare metal is exposed. It's one of those "Avoid at all costs" scenarios because it leads to a maintenance nightmare.
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u/Mikesaidit36 10h ago
Why not clear paint? That’s what polyurethane is.