Window film provides specific personal and property protection from the effects of the sun, as well as added safety and security in the events that result in broken glass. It can also be used as a decorative glass addition, adding character and style to any given space. There are many types and constructions of solar control, safety and decorative window films. In their simplest forms, window films are composed of a polyester substrate to which a scratch resistant coating is applied on one side; a mounting adhesive layer and a protective release liner is applied to the other side. When the release liner is removed, the side of the film with the adhesive is applied to the interior surface of the glass.