Can the window films from 4S stores be applied?

[OOmar]

4S stores often provide free window films that are generally low-quality with poor heat insulation or mid-to-low-end products from certain brands. While not absolute, this is quite common. As for the films available for additional purchase in-store, if they offer objective testing opportunities, they might be acceptable. However, if no testing is available and the installation process is unclear, it's generally not recommended. Below is an introduction to automotive window films: 1. Good privacy protection: Most automotive films are one-way, protecting the owner's privacy, but owners should carefully select the film. 2. Anti-shatter effect: In case of an accident, the film helps keep shattered glass together, preventing dangerous flying shards and protecting passengers. 3. Heat insulation: High-quality automotive films provide effective heat insulation, controlling temperature rise in summer and retaining warmth in winter, creating a comfortable driving environment. 4. Reduced light transmittance: Automotive films typically have a light transmittance of no more than 90%, especially on the windshield, which may slightly reduce visibility and affect driving safety.