I also have a sportivo ZR6 like yours and have "tinted" my tail lights. I did my research and found that the tint is not really that up to scratch, even asked several window tinting businesses, I was told the tint plasic film after a few months looses its quality and ends up looking cheap and tacky.. but and one of then pointed me to the direction to smash repairs.. These guys remove the lights and mix a clear coat with a lil bit of black and spray the lights, cost me 100 bucks all up and the results look AWESOME, get asked every second day about them and most of all it looks professional..