Paint that's exposed to sun (especially in the southwest) without any sort of regular waxing or UV protectant WILL fade, deteriorate, and eventually crack. Even silver. Tops of my fenders are faded and "ashy" from clearcoat deterioration. Don't really care honestly since I consider the truck a tool more than anything. If the paint gets bad enough, eventually I'll just rattle can the whole thing tan or gray. Crappy thing though, is that once clear coat deteriorates to the point that it's visibly noticeable, there's no fixing/stopping it. Alternative is to repaint.