There's some paint called 'Night Shades', comes in an aerosol. Lordco.
I've tried tinting my tail lights twice with it. I've sanded it off twice. I've seen other members lights tinted with the same stuff and they look really good. I just had a hard time with it. There was a body shop around here that was charging $100.00 for tails & corners, tinted to however. But, that was a while ago.