Just wondering, can carbon be sand-blasted or etched?
Basically I have just bought a CFRP monocoque chassis.  I got it at a substantial discount as while it is structurally sound, it is cosmetically flawed due to being post-cured at too high temperature, causing some rippling in the surface in a few areas.  I need to decide on the best way to smooth the surface ready for painting.  If I was to sand the ripples off with normal abrasive paper until the surface was smooth I fear I would be weakening the structure, as I'd be sanding down into the fiber before I got down to the bottom of the ripples.  Another option I have considered is to put filler in the ripples, however sanding into the bottom of the "valleys" would be awkward with normal sandpaper in order to give the filler a key to bond to.  So I was wondering, is there anyway I could lightly sandblast these areas in order to get a nice key for applying filler in the low spots, or alternatively, is there some chemical I could apply to the surface to lightly etch the surface of the resin in order to give a key to body filler?

May thanks, lee.