This is experimenting with 2 layers of tint using 20% Rvinyl tint over the peeling stock 35% tint (at brake light area) (2 layer tint method like limousines and some undercover police officers do) only because I wanted to darken the view of my new stereo and it worked perfectly. I did run into a few issues installing the tint (completely my fault.) It did have a tenancy to stick to itself, but I should have used more water which was my main problem. I had a few wrinkles/tint creases at the top I had to get out with a heat gun and plastic spatula that still came out great. There were also a lot of water marks that made me very worried! But the next day at work baking in the sun they ALL COMPLETELY went away. The glue is good quality from what I can see so far. The tint did touch the dirty fabric at the top which is part of the creasing problem, but washed it off and it's fine and I didn't align it properly at the bottom left corner :( So a few marks from tint sticking together because I'm an idiot, a few tiny marks from interior touching tint, a few creased areas which are all not visible from outside. Still looks amazing. Very happy overall with the tint and company and the opportunity provided to share your work!! Make: Buick Model: Regal GS Year: 2001