Just remember, they make these things just as thin as they can get away with and maintain the balance of strength and that "trampoline effect", MOI, yada-yada-yada. If you go sanding or polishing, you'll be taking material off the face and weakening it, making it more likely to crack or dent. Depending on how hard you swing, etc. it may never matter, but then again, it might shorten the usable life of the club if you sand it smooth.