Methods of bonding plastics are described herein. The method includes providing a substrate having a melting temperature in a first range, providing a bonding film having a melting temperature in the first range, providing an adhesive layer, providing an optical film having a melting temperature in a second range, laminating the bonding film, the adhesive layer, and optical film together, and bonding the laminate to the substrate. Another method includes providing the substrate and the optical film, coating the substrate with a thermal matching layer having a melting temperature in the second range, or coating the optical film with a thermal matching layer having a melting temperature in the first range, and bonding the thermal matching layer to the substrate or the optical film that is uncoated with the thermal matching layer. A difference between melting temperatures of the substrate and the optical film is about 50 to 250° F.