Prepping them.........I started to Scotch-Brite the mirror finish on one of them, and then was cleaning the dust off with a rag doused in cellulose thinners, when I noticed the mirroring just wiping off completely..........
So I wiped over the rest of it and bob's your uncle, it's alot less hassle than keying it all.
You just have to be careful not to soak the plastic too much as it does soften the surface of it.
The ribbing shape around the main and dip beam are a pain but with patience you can get it 80% off.
It doesn't need to be perfect, and you can abrade it all finally before painting anyway.
Left them for 15 mins to allow the thinners to dry off, then hit it with plastic primer (grey).
A quick light coat, then left 5 mins to flash-off, and then a good coat all over.
After an hour, I top-coated them with satin black paint - working from the back into the openings for a quick first hit, the ensure the ridges all got painted, and then after a couple of minutes, painted the front sides.
I've swapped to the obligatory Diadem indicator bulbs just to funk-up the look (hardly new idea, but still cool imho).
Now just got to mastic the lenses back on, and we're done.......

Turbo Power........