Pure, unmodified, unadulterated Also, known as China Wood Oil and Nut Oil. The most water, caustic acid, heat, and mildew resistant of all the oil finishes and the most durable. Apply only to new or prepared wood. Tung Oil is also used to manufacture many different types of varnish. Due to Tung Oil's pure, unmodified, unadulterated concentrated formula, a ratio of four parts of B603-28516 Rockhard Table Top Varnish Reducer (or Mineral Spirits) to one part Tung Oil is suggested. Apply with a clean cloth.