some members will tell you for that your safety, and the safety of others, dont tint your taillights no matter how dark because it does negatively impact the illumination. plus it also gives other the mpression that our cars are the bad street racer crowd of people with blacked out lights and loud exhaust.
me personally i do have tinted tails despite all the negatives. why? because i like them and its my car.
i used vht night shade from the local autoparts store and only did one coat of it. heres pics of mine