Nope. If it was used when I got my tint then nobody mentioned it. It's also possible that the tint referenced in that thread was too thick or something. In any case, I never came across it doing research on other 3 Series tint jobs. I'd say ask a good tinter about it and if he says you don't need it, then if he's got a good reputation, trust him -- after all, good tint jobs have lifetime warranties on their work, so if it does scratch you should be entitled to a free replacement job. Good luck!