There is no specific amount of time that protective film adhesive lasts, because there are many variables that can affect its use and performance in a particular application. Factors such as the type the surface being adhered to, quality of application, external conditions, and type of final application can all affect the performance of the adhesive product. For low humidity, room temperature application, protective film adhesive should last more than a year without problems. However, prior to purchase, it is essential that you evaluate the protective film to determine whether it is fit for your particular purpose and suitable for your method of application. Please contact us, we’d be happy to provide samples for evaluation.