PET/PI pre-coating film is a surface treatment on the surface of the substrate to enhance the viscosity, and when PET/PI is used as a supporting material, it is not easy to separate from the bonded material. Materials such as foam, silicone, polyurethane, acrylic, PU and other materials bonded to it will not be torn off. This material is non-standard customization, and the surface treatment of each material is different. Order procedure, first communicate to clarify the specific functional requirements, small batch samples, and then mass production.