Take the top off of a 12-ounce plastic squeeze bottle. Insert a funnel into the bottle.
Pour 6 ounces of Tung oil into the bottle through the funnel. Tung oil is a traditional oil used to polish and treat teak wood, but it does not darken or alter the color of the wood.
Pour up to 6 ounces of linseed oil into the bottle through the funnel. Linseed oil will darken the teak wood. Add the linseed oil 1 ounce at a time until you reach the desired darkness of the teak oil.
Remove the funnel and screw the top back onto the squeeze bottle.
Shake the bottle vigorously for a couple of minutes to combine the two oils completely before use.