Installing a second layer of window film before the first layer has fully dried can ruin the appearance of the installation. When double-layered, the edges of the film would be evident, which will impact the appearance. ... With that being said, layering window film will make dirt noticeable.Aug 6, 2019
What happens if you put tint over tint?
Aftermarket tint, unlike factory tint, cannot be easily tinted over. Don't forget — you can't go lighter. Because factory tint is in the window, you can't have it removed to go lighter in tint. When factory tint is involved, the only thing you can do is go darker.