Welcome to the Auto window tinting group of SmartGuy.com. Feel free to interact with other professionals from across the world. You can find professionals, find deals on services, find professionals who might barter, or simple post questions, comments. Window film is a thin laminate film that can be installed to the interior or exterior of glass surfaces in automobiles. It is usually made from Polyethylene Terephthalate (PET), a thermoplastic polymer resin of the polyester family, due to its clarity, tensile strength, dimensional stability, and ability to accept a variety of surface-applied or embedded treatments.