When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I did mine with tape from Home Depot. Huge difference in light output - the parking lights are now as bright as the brake lights used to be. First pic is 'before', bottom two are the 'afters'.
Because I was looking at it for other reasons, it's on my mind (for intakes and cam covers, though it seems to be really expensive), what about Cerakote? The really reflective ones "only" go to 300 F but that's probably enough and it should be plenty durable, if you believe their marketing pitches.
Careful taping looks awfully good, as well, from the pictures up there, and is likely way cheaper.