Is the window film applied on the inside or outside?

[DelMaverick]

Window film is applied on the inside because it is less exposed to wind, rain, and sunlight, which helps extend its lifespan. Here is some relevant information about automotive window film: 1. No damage, no need for replacement: Automotive window film generally only needs to be applied once and does not require further replacement. The film usually comes with a warranty of 10 or 15 years, offering high clarity and excellent heat insulation and explosion-proof performance. 2. Poor-quality film needs replacement: If it is a poor-quality film, it might need to be replaced every summer because it cannot withstand prolonged exposure to sunlight. Some may even fade or bubble, affecting visibility while driving.