Apparently, its duct foil tape, you can also get chrome vinyl, main concern is apparently a headlight reaches 150˚C. Maybe not for a manta?
But i have researched this for a while now, top is metalization, which is aluminium vapourised in a pressurised chamber. You can guess how much this is?
Next up is chrome plating, which involves three processes, actually this is the most expensive,
Next up was chrome powder coating! Then hydro spraying, then hydro dipping, then airbrushing with chrome paint, and laquered involves process where the reflector starts gloss black.
all but the metalization, are untested against bulb heat and uncertain how long these will last, non are exactly cheap.
bottom line is foil tape and chrome vinyl. But hard to beat a nice set of headlights! 🤤🤤🤩😋