Does the Ultraviolet Protection in 3M Window Film Lose Its Effectiveness Over Time?

No, the ultraviolet (UV) protection in 3M window film does not lose its effectiveness over time. The UV-blocking capability is embedded in the film’s proprietary adhesive system, ensuring it remains indefinite. For example, a test conducted on a 10-year-old window film sample from The Dumbarton House in Washington, DC, showed that it still blocked UV transmission to less than 1%, maintaining its protective qualities over the years.