I tried Joe's new shaft sealer, and promised a honest review. If sponged on liberally it soaks in a little and hardens the surface slighly. It does a good job of sealing. I think dipping an inch or so of the two ends of shaft in it far a minute or so before starting the turning process is a good idea. That would totally seal the ends of the shaft through the whole turning process. It raises the grain slightly, but that sands out easy enough. I am not sure if it stabilizes the cue as well as Nelsonite, but it is a real good sealer to use after the final cut before sanding.
So I am using it before sanding. Then I final seal with my shaft sealer, sand with 600 and wax. It works out really good. I would not think it is the right sealer for repair work when reconditioning the shaft, (although it might work for that), but is more of a replacement for Nelsonite. I have not tried it under the cue cote yet, but plan too. I suspect it will stop the wood from breathing into the finish causing unwanted bubbles.