Hi All,
I know this is an old post but a good solution to the cracking problem the first time around at least is to lightly sand the affected bind to give a keyed surface and recoat with a light coat of epoxy, you will find the epoxy will migrate straight into the crack serving to repair it and giving a new finish. In leiu of a rod lathe a dirt cheap battery powered rotiserrie motor coupled with a gimble cap attached to a small square shaft of wood via a screw works. Yes, I know, I'm a cheapskate, but it works!
Cheers,
John.