Should the front windshield film be applied on the outside or inside?

[LincolnRose]

Front windshield films are always applied on the inside. If applied on the outside, exposure to wind and rain would reduce its service life by at least two-thirds. Moreover, if applied externally, glass fragments from impacts could still injure people, failing to serve the purpose of explosion-proof film. Below is relevant information about automotive films: 1. Concept: Automotive film (Auto-film) refers to applying a thin film material to vehicle windshields (front/rear), side windows, and sunroofs. This film is also called sun control film or heat insulation film. 2. Functions: Its primary purposes include blocking UV rays, reducing heat transmission, preventing injuries from glass shattering, and minimizing glare. The one-way visibility feature also protects personal privacy. Additionally, it reduces UV damage to interior items and passengers while physically reflecting sunlight to lower cabin temperature, thereby decreasing AC usage, improving fuel efficiency, and saving costs.