This product is absolutely terrific! When I say this product is easy to use, I mean it is EASY TO USE! This was the first time I have ever tinted anything in my entire life and the end result is terrific. I was nervous going into things but soon realized there was nothing to worry about when I began installing the window tint. I purchased a 20% window tint all around and layered this tint on top of the factory tint on the rear windows and it came out perfect. I am grateful for this website and product and cannot be more pleased with your service!