I a smoke tint made for tail lights, dupli-colors and others have it.
Coats, I do not remember probably 3 or 4, just add coats till you are satisfied with the colour.

I removed the lights from the car, easier to work with.

Yes, I masked the area I wanted to remain clear.

Easy to do. '08 RRS TDV8
I converted my diesel RRS to run on an environmentally friendly mixture of caribou fat and baby seals oil