Yes, you can buff a vinyl wrap. It all depends on the thickness of the vinyl wrap, the strength of its adhesive, and the characteristics of the surface underneath (paint/wet sand, etc.).  Buffing can help to get rid of small scratches and imperfections in the surface underneath, but that is not the norm. The most common buffing practices are something such as a cutting compound or a polishing compound, which are used to polish the clear coat layer on your car's body. Most painted panels will be handled with a cutting compound, and the buffed vinyl. These buffing compounds gently polish the paint without removing any material.  Most of the time, if you have a vinyl wrap professionally installed, it will not be easy to buff out because the vinyl has been applied over an epoxy primer. This, combined with the strength of the vinyl adhesive, will make buffing extremely difficult and not worth the effort.  If you are interested in buffing your vinyl, do some research on it first to determine if it is something you can do.