We think this quote from the Waterlox website says it all about their Tung-oil based sealers, interior, and marine finishes: "For 600 years the Chinese have treated boat timbers with tung oil. Tung oil, pressed from the nut of the tung tree, was used to waterproof Chinese ships as long ago as the 14th century. The thin, transparent oil penetrates deep into wood pores, forming an almost permanent seal against moisture because it never loses its elasticity. " Waterlox® Interior Products All interior wood surfaces, including wood floors, cabinetry, doors, furniture, and more. Great for restoring antiques, furniture, fly fishing rods and gunstocks. Waterlox® Exterior/Marine Uses As with the Interior Tung Oil Based products, the Marine products penetrate into the wood to lock out dirt, moisture, acids, household chemicals, heat and cold. Waterlox® Marine products also stand up to sun, salt and fresh water exposure, for all marine and exterior wood applications, including doors, eaves, porches, furniture, and boat decks. Waterlox Original Marine Finish is specially made for boat decks, bright work and spars and for other heavy-duty exterior applications, such as doors. Provides a high gloss finish of exceptional depth. -from waterlox.com Marine Finishes Waterlox® Interior Sealers and Finishes ©2008 Public Lumber Company. All rights reserved.