[Mackie]

Providing a good supplemental ground is very important too. I connected 14ga to the back of each housing run separately to the frame. Did the same with the license light.

IIRC I used rattle can epoxy white but prepped the snot out of the buckets first. New repop lenses and gaskets and I haven't seen any heat effects to the paint yet in about 2 yrs. use and it's a driver. The lights are bright and stand out way better. I got the idea from a street rod forum I visit. The poster put up the results of an extensive test, with pics, using various bulbs and housing coatings. White was a clear winner.
LED 1157s would maybe be even better...low heat for sure.