If the finish of your piece is completely worn off, apply Dr. Woodwell's Wood Elixir™ generously with a brush. Apply a second coat with extra fine steel wool to remove any flakes of the old finish and to smooth and seal the new surface. Buff with a clean cloth.
In the above example, Wood Elixir was used on an antique wood plane where the existing finish had been worn off. Note that the oils in Wood Elixir were absorbed into the raw wood, producing a pleasant, natural finish.