The application of oil to a natural wood surface preserves the original texture of the wood and helps to seal it from outside moisture. The best oil to use is boiled linseed oil which can be applied with a lint- free cloth and will dry after being absorbed by the wood. You may need to apply more than one coat of oil to get a complete seal, and you should re-apply the oil about once a year to maintain the seal. Simply rub the oil into the wood grain and allow it to dry. Do not brush oil onto the surface or allow it to puddle or run.
Excess oil can cake when drying producing unsightly blotches in the finish.
Another method that can be used to seal the wood surface employs the use of oil and paste wax. This will produce a hand-polished type of finish. Apply one or more coats of oil as described in the previous paragraph, and allow the surface to dry thoroughly. Then, using a separate lint-free cloth, evenly apply a coat of paste wax. It is a good idea to allow the paste wax container to remain at room temperature for a few hours if it is stored in a cool place, to let the wax soften for use.