Johnson Window Film. i have personally never had ANY scrathces appear on any of my tint, on any of my cars, including my wife's 06 GT, except the ones that were tinted with Llumar or any other brand of tint. i am sure there are people out there that like Llumar and think it's the best, i am sure some people think Gila is good too, however, look both of them up on the web, and look at their warranty, it is not nearly as good as some of the others. i can't speak of 3M because i have never used it, so it is up to that person to decide. i have had 16 vehicles tinted with Johnson Window Film, and not one has ever scratched or discolored. is it the best, i don't know. i am sure there is better out there somewhere, but i am happy with what i have.
here's another thing to think about, if you use the moleskin on your car, and for some reason it comes off and gets rolled down into the door and jambs up the window, not saying it could happen, but what if. do you think your warranty will cover it since you added something to it? i would have to say probably not. i am not a mechanic, nor am i a professional tinter, but i would think a professional would make sure they warranty their work, even against scrathces. if they use a good quality tint.