External reason one, window glass heating wire. Now the rear window glass of automobile generally has heating wire, which has defrosting function and is beneficial to driving safety. However, the heat produced by the heating wire is blocked by the solar film attached to the inside of the glass and can not be dissipated quickly, while the exposed glass can be cooled quickly in winter. The solar film tightly attached to the glass can not expand and contract with it. It gradually relaxes in the cold and heat, and blisters sooner or later. Jinan Tieke recommends countermeasures. If there is any problem with the solar film with a warranty period of 10 years or more, it can be replaced free of charge, and the quality is guaranteed.

外部原因二，贴膜技术水平及工具。太阳膜是半成品，贴在车窗玻璃上效果好坏很大程度上取决于贴膜师父的贴膜技术水平和是否选用贴膜工具。济南贴客应对之策，到正规老店去贴膜，那里的贴膜师父和工具都是经得起考验的。

The second external reason is the level of film technology and tools. Solar film is a semi-finished product, and the effect of sticking it on the window glass depends largely on the film master's film application technology and whether to choose film application tools. Jinan Tieke recommended countermeasures, to the regular old shop to film, where the film master and tools are able to withstand the test.

内部原因，太阳膜自身质量。多层结构的聚酯薄膜是众多太阳膜选基材，性能可靠稳定，韧性好。不会出现起泡现象。车主贴膜要到资质齐备的汽车美容店，让经验老到的贴膜师父使用贴膜工具贴正规厂家的行货太阳膜。

The internal reason is the quality of the solar film itself. Multilayer structure of polyester film is the choice of many brands of solar film substrate, reliable and stable performance, good toughness. There will be no blistering. The car owner should go to the car beauty shop with complete qualification to apply the film. Let the experienced film master use the film tools to apply the professional solar film of the regular manufacturer.