Not technically a cue maker, but my thoughts on this would be if it's a wrapped cue you have used for awhile, no. All your hand oils, what ever else, some even rub a sticky wax and burnish it in to make it less slippery. I would think they would want to put a new wrap on first before coating. Also it may be possible to coat your existing wrap first with something such as Bullseye Zinsser Seal coat, which is a dewaxed shellac, and maybe that would seal it good enough to be finished. I have a friend that had a cue refinished and they put a new wrap on first before coating over it.