My friend just sprayed his 300ZX t/turbo intake that he polished to a nice shine with clear, and it turned out like chit. It had runs where he tried to make it an even coat, and it got all "pasty" looking after having it on the car. He ended up polishing all of the clear off, and leaving it as is. Something to consider. Just keep it relatively clean(wipe it off occasionally)
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1993 GT/AOD
'93 Mustang GT