ive had my taillights done for about a year now. used 3 or 4 coats on mine. i didnt go real dark cause i didnt want to get hassled by the fuzz out here. in the sunlight you can still see a slight tint of red through the black.

Yep, sweet is right. same here.

UPDATE!!

well its been about 18 months since ive had my car and had the taillights tinted with Nightshades. as of now almost all of the tint has come off. its just gradually faded over time and now is almost non existant. i guess its been due to car washings and rain and what not. but apparently it is not permanent by any means.

just an FYI if you have used nightshades. i would look to redo it every year or so if you want to keep them tinted like they were the first time.