Before applying the letters with the adhesive you must clean, clean, and clean again! When the bumper and sills were made they used a "release agent" which must be thoroughly removed or the letters will fall off. While I also like the lighted bumper it is a LOT of work and there are no "kits". There is precedence to painting the bumper. I think it was Proto I they did it to because marketing thought it was not noticeable enough and they wanted it more prominent.