Should the windshield film be applied on the inside or outside?
2 Answers
The windshield film should be applied on the outside, but it is not recommended to apply film to the front windshield as it may affect visibility. The front windshield itself has the function of blocking ultraviolet rays, so there is no need for additional film. Car window film refers to applying a thin film-like material to the front and rear windshields, side windows, and sunroof of a vehicle. This film-like material is also called solar film or heat-insulating film. Its main functions are to block ultraviolet rays, reduce heat, prevent injuries caused by glass shattering, reduce glare, and protect personal privacy based on the one-way transparency feature of the solar film.
With years of experience in car accessories research, I can confirm that windshield films are always applied on the interior side rather than the exterior—this is standard practice. The exterior is prone to erosion from wind and rain, as well as scratches from sand and gravel, which would shorten the film's lifespan. Applying it on the interior ensures better adhesion to the glass, providing superior heat insulation, reflecting UV rays and heat, and protecting passengers from excessive heat. Additionally, interior installation doesn’t obstruct visibility or cause bubbling, ensuring higher safety. It’s recommended to have it professionally installed at reputable shops, as low-quality films may wrinkle over time and affect aesthetics. Remember, the same principle applies to side window films—installing them on the interior makes maintenance easier. From practical experience, the correct installation method saves both money and hassle in the long run.
