Tung oil is one of the most misrepresented finishes in the hardware store. Almost every product sold as "tung oil" or "tung oil finish" contains little or no actual tung oil. They are varnish-based finishes with tung oil listed as an ingredient. Pure tung oil is a different material with different properties, different application, and a different result — one that is correct for traditional interior wood in a New England context.
Pure tung oil produces a low-sheen, warm, penetrating finish that allows the wood grain and color to read clearly. It does not build a film on the surface. The wood feels like wood — not like it has been coated. The sheen is similar to an oiled surface: present but not glossy. It darkens the wood slightly and enriches the grain.
Pure tung oil is the pressed oil of the seed of the tung tree (Vernicia fordii), native to China and widely cultivated. It is a drying oil — it polymerizes when exposed to air, producing a hardened, water-resistant film within the wood pores. Applied in multiple thin coats with complete drying between coats, it builds a durable, renewable finish. Pure tung oil is available from Tried and True (Trumansburg, NY), Real Milk Paint Company, and specialty wood finishing suppliers.
Pure tung oil penetrates and hardens within the wood. It is water-resistant but not waterproof — a wet glass left on a tung-oiled surface will eventually leave a mark. It is renewable: a worn area can be cleaned, lightly scuffed, and re-oiled without stripping the entire surface. This renewability is its great advantage over film-building finishes.
Tung oil is the correct finish for wide plank pine floors, interior furniture-grade millwork, and wood surfaces in traditional New England interiors where the penetrating, grain-revealing character of an oil finish is the specification. It is not the correct finish where a hard, waterproof film is required.
Tried and True Original Wood Finish (pure tung oil polymerized without solvents) or Real Milk Paint Pure Tung Oil from specialty dealers. Do not substitute a product labeled "tung oil finish" — it is varnish, not tung oil.
Pure tung oil, three to four coats applied thin and fully cured between coats, for interior wood surfaces in traditional New England buildings where a penetrating, low-sheen, grain-revealing finish is the specification. Tried and True or equivalent. This is a maintenance finish — renew every three to five years on high-wear surfaces with a single thin coat.
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