Although Plasti Dip works and behaves exactly the same for most users, there are certainly specific circumastances in which the Plasti Dip could not behave as expected. The age of the car, the condition of the clear coat, if you have already done a DIY paint job on the surface, etc. are all possible factors that could effect the way the Plasti Dip bonds, peels, or the covers. Although most users will have a predicatable and trouble free experience with dip, we suggest you do a small test spot on the surafaces you will be dipping before you begin your project.