I've used everything from paraffin to various "oils" to polys to high end Thunderbird Endurance Epoxy sprayed on with an HPLV gun. As a do-it-yourselfer, though, I've come full circle and prefer Minwax Helmsman spar urethane in the spray cans. Durable, fast and easy to apply, and no cleanup. I use 5 or 6 coats of gloss, followed by 2 coats of satin. Looks smooth and lovely with osage and hickory.