Put on rubber gloves and pour a generous amount of teak oil on a clean, lint-free rag.
Rub the teak oil into the wood using long, straight strokes, working with the grain of the wood. Start at the top of the piece and work your way down to the bottom, coating both sides of the wood.
Allow the teak oil to dry overnight, then reapply.
Allow the teak oil to dry overnight again, then apply a final coat of teak oil. Allow the teak oil to dry a final time until all of the oil is absorbed into the wood. This can take up to three days. You'll know that the oil has absorbed into the wood when a clean rag rubbed on the teak comes away clean.