What Causes the Glittery Powder to Fall Off Car Window Films?
2 Answers
Car window films shedding glittery powder is caused by film corrosion and aging. Introduction to Car Window Films: Car window tinting involves applying a thin film layer to the vehicle's front/rear windshields, side windows, and sunroof. This film is commonly called solar film or heat insulation film. Functions of Car Window Films: The primary functions include blocking ultraviolet rays, reducing heat transmission, preventing injury from shattered glass, reducing glare, and protecting privacy through one-way visibility. Additionally, it minimizes UV damage to interior items and passengers while physically reflecting sunlight to lower cabin temperature, thereby reducing AC usage, decreasing fuel consumption, and saving costs.
I encountered this situation last time as well. It's quite common for car window films to shed shiny, glittery powder. Generally speaking, it's mainly caused by material issues or aging of the film. If you use cheap films, they may contain low-quality chemical coatings that become brittle and start shedding powder over time, especially on hot days when sunlight accelerates this process. Improper installation is another reason. Like when I tried to save money by installing the film myself, the adhesive wasn't applied evenly, allowing air to get trapped in the gaps, which gradually decomposed into that shiny powder. Daily exposure to wind and rain while driving, combined with windshield wiper friction, makes the film surface more prone to wear. I think the preventive measures are to choose thicker, branded films, regularly inspect the film surface for cracks or bubbles, and avoid prolonged direct sunlight exposure. This can extend its lifespan and reduce powder shedding issues. Otherwise, the powder floating into the car can affect breathing, so extra attention is needed.
