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How to apply tung oil
Clean the wood surface with a damp cloth.
Wet the cloth with warm water and wring out the excess moisture. Wipe down the wood using long, linear strokes or smooth circles, working against the grain.
When you're done, give the surface a few minutes to dry to the touch. Your wood surface needs to be free of dust, dirt, oil and other messes in order for the tung oil to set up properly.