How durable does it have to be? Look up “film finishes.”
As durable as a ring has to be...?
Wipe on polyurethane? It is thinned down so it will not build up enough to chip off.
Edit; come to think of it any thinned down barrier coat would be better than an oil which will dissipate. high-quality shellac thinned with alcohol or nitrocellulose lacquer thinned with lacquer thinner. You could even play around with clear nail polish that I think is thinned with acetone.
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