Abstract: Transparent edge sealed window films substantially minimize (if not eliminate entirely) degradative effects on the window film, particularly solar-reflecting metals and/or oxides associated with multilayer window films, caused by ambient conditions (e.g., commercial window cleaners, salt and the like). The edges of window films are preferably sealed by a liquid solvated polymeric material which, upon curing, provides a solid transparent seal which significantly minimizes the degradative effects of the ambient environment. Most preferably, the window film whose edges are sealed will include a transparent thermoplastic (e.g., a polyester) film layer and a solar-reflecting metal and/or oxide applied onto a surface of the film layer. The sealant for such a preferred window film will be a polyester-type sealant which has silane end-group functionality and substantially no free isocyanate groups.

Abstract: Window film (e.g., solar film) is edge-sealed by moving a porous applicator tip saturated with liquid sealant in wiping contact along an edge of the window film to be sealed so as to transfer a portion of the liquid sealant from the saturated applicator tip to the window film edge. Thereafter, the liquid sealant is allowed to dry so that a residue of the sealant (e.g., most preferably a solvated plastics material) remains as a transparent layer sealing the space between the window film edge and the adjacent window glass frame. Most preferably, a kit is provided which includes a pen-like applicator and a container which contains a quantity of liquid sealant. The applicator is provided with the porous applicator tip at one end in fluid communication with a barrel defining an interior reservoir space.