I figure they don't get handled all that much, so I've used the HUT wax system on my latest... 3 coats of brown, then three coats of white, high speed buffing in between with paper towels, then 3 coats of carnuba - again buffed out with paper towels... a finish takes 10-15 minutes.
I've also tried the spray lacquers - which I don't like and multiple coats of polyurethane... problem with poly and lacquer is sanding between coats and drying time... the finish becomes too time consuming for what I charge for bottle stoppers.