If it really needs refinishing, send it to a pro. Why risk it?
Did he say it needs refinishing?
IMHO, several high grade wax finishes are suitable.
If the British Museum and restoration specialists internationally use Renaissance Wax to revive and protect furniture,
art frames, ivory, etc., it should be ideally suited for use on pool cues, much more so than other commercial products.
That is a high grade wax suitable for fine finishes on valuable pieces.
I have seen you post this before and honestly think it deserves more attention.
Any cue finish should benefit from a protective wax coating. More modern coatings are ceramic. There is controversy about using such a thing on a shaft, but likely it can work well on a butt. I would be careful with a truly valuable cue though.
I would recommend contacting a cue maker for their recommendation of the care and preservation of their work if they are still around.
For really high grade cues, meaning those that are extremely valuable, nothing on it would be my first answer. If they are on display they should be behind glass with UV coating or plexi with UV protection.
The best of the best cues with original finish need to be considered carefully for preservation. Don't do anything that could react with the original finish. Generally speaking high grade waxes are excellent, and can be stripped and reapplied if needed without toughing the underlying original finish.
I think one needs to consider whether the cue is in use, on display, or in storage as well when one considers whether or not to put anything at all on it.
Most of my cues just get wiped off. A few get wax. I haven't tried any synthetic or ceramic coatings at all and am hesitant to do so.
My joss? That just has decades of hands on use and occasional wipe down. But it certainly isn't a "high grade" valuable cue. It's a player.