Formby's tung oil, at your local hardware store, is the best I've found. Brushes on very easy, has a low solid content so dries thin, and is very durable. Only "downside" is it'll take a week to fully cure though it can be handled within a day. I also use this to varnish the barrels. It's offered in either gloss or satin--I use satin but can't really tell much difference. MUCH superior to wax.
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