My personal favorite is a mixture of 1/3 Boiled linseed Oil, 1/3 Spar Varnish and 1/3 Polyurothane. Fine sand down to 400 then put a heavy coat on. Sand while wet with 400 wet and dry. Let dry a day. Then put another coat on and sand with 600 wet and dry. Let dry a couple days. Finally put the last coat on and burnish with 000 steel wool. Let dry a couple of days then wax with a hard canuba wax. Buff it out.
tim in san jose