To Install Peel From Backing Paper you can spray it with Water line it up then squeegee all the water out and then peel Application Tape and your finished. If you use this on a window make sure to do it in sun on hot day or at room temperature make sure the water is dry if on window before removing application tape.
Windows hold moisture more then metal so make sure it is squeegeed good before trying to remove application tape. Can install with no water as well. Does not harm your paint!