I, too, used Lumar on my cars in the past and liked it. It was good quality film. As far as I can remember, I never had problems with it scratching, bubbling, etc. But I haven't had the windows tinted in my last 4 cars. It's alright in the daytime, but makes it difficult to see at night. I'm thinking about getting my windows tinted now, though. I think 35% on Carbon Black would look great! Problem is, I have the shades and I think tinting the windows would defeat the purpose of having spent that money. What to do?