V rays from the sun that are responsible for damaging your cars interior and excessive heat build-up are usually the cause of bubbles forming in the window tint. The bubbles are a result of a failure in the adhesive system. Protect yourself from this potential problem by purchasing a major brand name window tint material. The major window tint manufacturers, in their high performance and metal window tints, have a high temperature adhesive system and 99% of UV protection capabilities, which along with the metalizing technology, allows them to give a manufacture backed guarantee against bubbling of window tinting. These films are available from most reputable installers.