Is the windshield film applied on the outside or inside?

[DeRose]

The windshield film is applied on the inside of the glass. Its functions include blocking ultraviolet rays, reducing heat transmission, and preventing injuries caused by sudden glass shattering. Additionally, it serves to protect personal privacy based on the one-way visibility feature of the solar film. Below are the steps for applying car film: 1. Before applying the film, it is essential to cover necessary interior parts of the car to prevent liquid infiltration. The sprayed cleaning and lubricating fluids can affect the vehicle's electronic equipment and interior decorative components like seats. 2. Cleaning the inner and outer surfaces of the window before applying the film ensures there are no impurities or foreign objects between the heat-insulating film and the glass, guaranteeing a perfect bond. 3. Use a ruler to measure the dimensions of the front and rear windshields, then cut the film according to the measured size. 4. Spray the installation liquid. 5. Perform dry baking on the heat-insulating film to allow it to fully pre-shrink. 6. Use a squeegee to remove the installation liquid between the heat-insulating film and the window glass, which reduces drying time and ensures better adhesion, overall performance, and visual effect. 7. After completing the film application, check if the edges of the heat-insulating film are firmly adhered. It is recommended not to roll the windows up or down within 48 hours after applying the film.

[Adaline]

The windshield film must absolutely be applied on the inside. As a long-time car owner, I’ve personally experienced this issue. If applied on the outside, for example, during rainy or windy weather, the wipers will repeatedly rub against it, causing the film to easily get scratched or peel off. Worse yet, water might seep in and create bubbles, obstructing visibility. Applying it on the inside is much more stable—the film adheres more smoothly to the glass, and the protective effect lasts longer. I remember reminding my neighbor when helping him apply the film: the inner surface is smooth, making it easier to clean and less prone to dust buildup. Additional benefits include effectively blocking strong sunlight and UV rays, keeping the car cooler in summer so your seat doesn’t get too hot, and preventing the dashboard from aging too quickly. When choosing a film, pay attention to light transmittance and heat insulation index—too low transmittance can make it hard to see the road at night. It’s best to have it installed professionally to avoid DIY mistakes like bubbles all over the screen. After installation, maintain it regularly—avoid strong acidic cleaners; a simple wipe with a damp cloth is cost-effective and practical.

[Donna]

You asked me where to install the windshield film, and I told you it should be on the inside. Installing it on the outside is too troublesome—car washes or daily wear and tear can easily damage it. I've seen people try it, and the film cracked within a few days, requiring a reinstall. Installing it on the inside is the reliable choice—the inner surface of the glass is smooth, providing strong adhesion, and you don’t have to worry much about daily wear. The installation steps aren’t complicated either: first, thoroughly clean the inner side of the glass, spray some water or specialized adhesive, then slowly smooth out the film to remove air bubbles. Beginners are advised to spend a little money on a professional installer to avoid risks and ensure quality. Don’t skimp on the film—low-quality films tend to fade or reflect light, interfering with visibility. For the front windshield, choose a high-transparency film, while the rear can be darker for enhanced privacy. Cost-wise, internal installation lasts for years, making it more economical overall. Also, be aware of local regulations—some areas have limits on light transmittance, and internal installation makes it easier to comply.

[McBraxton]

Windshield film must be applied on the inside for safety. Applying it on the outside poses risks—if impacted by external forces like gravel, the film can shatter into fragments and cause injuries. Installing it on the inside helps cushion glass breakage and protects the driver's eyes. It also reduces glare and reflections, ensuring clear visibility and lowering accident risks. Film quality depends on UV blocking rates—low-quality films degrade quickly and compromise safety. Regularly check for wear and replace if damaged.