What Tung Oil Does to Wood (And Why We Use It)

Most wood finishes sit on top of the wood. Polyurethane, lacquer, shellac — these build a coating over the surface that protects it by sealing it off. They're durable and they do the job, but they change what the wood feels like. The surface becomes the finish, not the wood.

Tung oil works differently. It penetrates.

What Penetrating Oil Actually Means

When you apply tung oil to raw wood, it soaks into the open grain pores and cures there — inside the wood rather than on top of it. The result is a finish that protects the wood while leaving the surface fundamentally intact. You're still touching wood. The grain is still open and visible and tactile in a way it isn't with a film finish.

We use pure tung oil — not a "tung oil finish" product, which is typically a blend of tung oil with other solvents and resins, but straight tung oil pressed from the seeds of the tung tree. It takes longer to cure than a blended product, and it requires proper application and patience, but what it produces is worth it.

What It Does to the Color and Figure

The first thing tung oil does is darken. Not dramatically — it doesn't stain — but it deepens the natural color of the wood in a way that reveals the figure. Red oak, which has a warm honey-gold tone when raw, becomes richer and more amber after oiling. The grain pattern, which was already visible, becomes more pronounced. Every piece looks more itself.

That color stabilizes after the cure. Unlike some finishes that continue to amber or yellow over time, properly cured tung oil holds fairly true. What you see after the final coat has cured is approximately what you'll see a year from now.

How We Apply It

We apply one to two coats depending on the piece, with full cure time between each — at least twenty-four hours, sometimes longer depending on ambient conditions. The first coat is the penetration coat: the wood drinks it up quickly, and we let it cure completely before going near it again. Between coats, the surface is buffed and polished rather than sanded — this keeps the grain texture intact while smoothing any raised fibers. If a second coat is needed, it's a lighter application, less about absorption and more about bringing the surface to the right level of protection and sheen.

After the final cure, the surface should be smooth without being slick, warm without being glossy, protected without feeling coated. That's what we're going for on every lid.

Why Not Something Else

We've tried other finishes. Waterlox is good. Danish oil works. Wipe-on poly is simple and durable. Each of them changes the feel of the wood in ways we don't want for this product. We want someone to hold a lid and feel locally sourced red oak — not feel a finish applied over red oak. Tung oil is the only way we've found to get there reliably, and it's the reason the finish on our products looks handcrafted rather than manufactured.

See also: How a Candle Lid Goes From Raw Wood to Finished Product for how this fits into the full production process.