I have used this product for many years and you have to really heat set the edges just like you do a vinyl wrap. If you leave any moisture under the edges it will fail. This product works very well and stays on for years if you really bake it in after installation. Only real issue is that the newer headlights and tails are becoming so complex that you just can not wrap them without doing it in pieces. I turn down more these days than I actually do for that reason.