It looks incredible. How many hours into it and what coating did you use? I didn't know you could use it on plastics or in a hot engine bay.

this is what i consider more of a 'nuclear option'.

if the clearcoat on the housings is yellowed/foggy only, the previous process i talked about should take care of it.

if the clear coat on the housing looks like cracked glass, or is flaking off, or appears to be missing in places while also looking like a matte, yellowish finish, than replacement of the coating like you describe is the best option.

but it's extremely labor intensive wet-sanding, and many of the better coating options are more closely related to very fumy 2-part epoxy systems.

so unless the headlamps have a lot of personal meaning, it's much easier to replace consider replacing either just the lens from another good headlamp, or to consider replacing the entire assembly with a factory-fresh headlamp.

it is typically better to go with replacing the entire assembly, as when most housing lenses reach this point of degradation, it is extremely common that the oem components within the assembly have degraded to some extent as well, and all that work into the outer lens still won't benefit the end result as outright housing replacement.

i've done a little of all of it with my past retrofitting hobby ;)

lately, been trying to get out of civilization for at least a weekend a month. Just hard to get on the forums since I don't have service at work and they keep increasing what gets blocked by our firewalls :mad0260:

Yeah, I'm way to lazy to do by hand but will look into some quality compounds. I've paid to have them done before but figure over the course of time and multiple cars would be cheaper to do it myself.

Too many hours spent unfortunately but that is expected when trying to polish BMW paint.