Is the front windshield film applied on the outside or inside?

[VonHarper]

The front windshield film is applied on the inside because long-term exposure to wind and sun on the outside can cause the film to lose adhesion, curl at the edges, or degrade in functionality. Applying the film on the inside protects it from external influences. Additionally, if applied on the outside, shattered glass fragments from an impact could injure people, negating the purpose of the anti-shatter film. It's important to note: The film must achieve a 70% light transmittance while also having high heat insulation and low visible light reflectivity, as traffic regulations stipulate that the visible light transmittance of the front windshield must not be less than 70%. Mirror-reflective sunshade films are prohibited on all vehicle windows.