There is a product called "Tru Oil" that I have used with succes over quite a few years. You put a couple of drops of it on an area about 6 square inches, and wet sand it into the wood with black sandpaper. Start with 320 grit - work your way up to 600. After each section is lightly sanded, wipe off with a clean piece of tissue and allow to dry. It takes a number of coats to fill the pores in the wood; but once you get there, it is a beautiful finish. If you ever get a scratch in the finish, you can simply put a small drop of the oil on it and wet sand it out in a few seconds.