Clear coating over polished aluminum will slightly dull the shine. A good clear coat will protect the finish and reduce maintenance. Just make double sure that all of the polish is removed and the surface is clean before the clear coat application.
Bare polished aluminum will be brighter, but the surface needs be maintained with a quality wax/cleaner. Polished aluminum should be towel dried after washing or rain to avoid spotting. There is no wrong choice.
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