How to Finish Wood with Rubio Monocoat: What I Learned at Their Lab

Why Rubio Monocoat?

I've tried a lot of finishes. Danish oil, polyurethane, lacquer, wax, tung oil. They all have their place. But Rubio Monocoat Oil Plus 2C is the one I keep coming back to, and the one I use on almost every project now.

Here's why: it's a single coat finish. One application, wipe on, wipe off, done. It bonds molecularly with the wood fiber, so there's no film sitting on top. The wood still feels like wood. And it's repairable. If you scratch it, you sand the spot and reapply. Try doing that with polyurethane.

I got invited to their lab in Belgium to see how they make it and to create my own custom color. That visit changed how I think about finishing.

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How It Works

Traditional finishes sit on top of the wood as a film. Rubio Monocoat works differently. The oil molecules bond with the cellulose fibers in the first few microns of the wood surface. Once bonded, the wood can't absorb any more oil. That's why one coat is enough, and why adding a second coat doesn't do anything.

This also means the finish is incredibly thin. You're not building up layers. You're changing the surface of the wood itself.

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Application (It's Embarrassingly Simple)

1. Sand to 150 grit (not higher, the oil needs open grain to bond)
2. Remove all dust
3. Apply a thin layer with a cloth or plastic spatula
4. Work it into the grain
5. After 3-5 minutes, wipe off ALL excess. This is critical. Leaving oil on the surface means sticky patches.
6. Done. Cure time is about 5 days for full hardness.

That's it. No second coat. No sanding between coats. No waiting overnight and reapplying.

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The Color Range

This is where it gets interesting. Rubio Monocoat Oil Plus 2C comes in over 60 colors. From pure (clear) to dark blacks, warm browns, cool greys, and everything in between.

The color you see depends heavily on the wood species. The same color looks completely different on oak vs pine vs walnut. Always test on a sample piece of the actual wood you're using.

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Exterior Finishes

For outdoor projects, Rubio makes DuroGrit, which adds UV protection and is designed for decking, fences, cladding, and garden furniture. Same easy application, just formulated for weather exposure.

For lighter outdoor maintenance, WoodCream is a simpler option that refreshes and protects without the full DuroGrit treatment.

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What I Learned at the Lab

Visiting the Rubio Monocoat lab in Belgium was a turning point. I got to see the raw pigments, the mixing process, and how they test durability. They let me create a custom color by mixing pigments by hand.

The biggest takeaway: surface preparation matters more than the finish itself. A perfectly sanded piece of cheap pine will look better than a poorly sanded piece of expensive oak. Every scratch, every machine mark, every bit of contamination shows up once the oil goes on.

Their team were obsessive about preparation. That stuck with me.

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Common Mistakes

Sanding too fine. If you sand beyond 180, the grain closes up and the oil can't penetrate. Stick to 150.

Not wiping off the excess. This is the number one mistake. If it's still wet after 5 minutes, wipe harder. Excess oil on the surface turns sticky and takes forever to cure.

Skipping the sample. Colors look different on every species. Test first. Always.

Applying in direct sunlight. The oil dries too fast and you get uneven coverage. Work in shade.

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The Verdict

It's not the cheapest finish per liter. But when you factor in that you only need one coat, no primer, no topcoat, no sanding between coats, the total cost per project is very competitive. And the result looks and feels natural in a way that film finishes just don't.

I'm a Rubio Monocoat ambassador now, which means I genuinely believe in the product. I wouldn't put my name next to something I don't use every week.

Check out the Finishing section on the tools page for all my finishing recommendations.