How to Seal Natural Wood: The Complete Guide for Wood Wall Planks

Whether you've already got raw wood planks on the wall and you're figuring out the finish, or you're still in the planning phase and want to know what you're getting into — this guide covers everything. We'll walk through which sealer to choose, how to apply it step by step, and (for those who haven't committed to raw wood yet) one option that skips the whole process entirely.

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Do You Actually Need to Seal Your Wood?

Not all wood needs sealing, and not all surfaces have the same requirements. Here's a quick way to think about it:

Raw or unfinished wood? Yes — seal it. Bare wood absorbs moisture, stains easily, and will show wear fast without a protective coat. If you bought unfinished planks or lumber, sealing is non-negotiable.

Pre-finished wood? Probably not. If your planks came with a factory finish already applied, adding another sealer on top can cause adhesion issues and an uneven appearance. Check the manufacturer's specs before adding anything.

Wall planks vs. floors — different needs. Floors take daily foot traffic, dropped things, and tracked-in moisture, so they need the most durable finish you can apply. Wall planks are much lower contact — they still benefit from sealing (especially in bathrooms or near fireplaces), but you have more flexibility in product choice and don't need as many coats.

High-moisture areas need extra attention. Bathrooms, kitchens, laundry rooms — anywhere humidity swings — call for a sealer rated for moisture resistance.

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Choosing the Right Sealer for Wood Walls

There's no single "best" sealer for every project. The right choice depends on your wood species, the location, and how much sheen you want.

Polyurethane

Polyurethane is the workhorse of wood finishes — oil-based versions in particular are exceptionally durable and build a thick, hard protective layer. It's the go-to for floors and high-traffic surfaces.

Best for: Floors, high-traffic areas, darker wood species where the amber tint won't be noticeable (or is actually desirable)

Worth knowing: Oil-based poly has stronger fumes and longer dry times. Water-based polyurethane is a cleaner option with lower VOCs, though it's slightly less durable. Both can yellow over time, which matters more on lighter woods.

Polycrylic

Polycrylic is a water-based protective finish that dries crystal clear — no amber tint, no strong fumes, and it cleans up with soap and water. It's become the standard recommendation for interior wood walls precisely because it's easier to work with and gentler on light-colored species.

Best for: Light or natural wood tones, interior wood wall planks, projects where you want low odor and fast dry time

Worth knowing: It's not as hard as oil-based polyurethane, so it's not the best call for floors. For walls and decorative surfaces, it's excellent.

Wax Finish

Paste wax gives wood a soft, matte sheen and a very natural feel. It penetrates and needs to be reapplied periodically.

Best for: Furniture, decorative accent pieces, low-contact surfaces where you want a natural, lived-in look

Worth knowing: Wax is not water-resistant enough for bathrooms or kitchens. Once you wax wood, applying a film finish (like poly) over it later becomes complicated.

Oil Finish

Penetrating oil finishes — tung oil, Danish oil, linseed oil — soak into the wood grain rather than sitting on top of it. The result is a very natural, no-finish-looking finish that enhances the wood's depth and color.

Best for: Projects where you want to preserve the natural look and feel of the wood; furniture; lower-traffic decorative walls

Worth knowing: Oil finishes require reapplication every year or two, and they offer less protection against moisture and abrasion than film finishes.

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Step-by-Step: How to Seal Wood Planks

Step 1: Sand First (220-Grit)

Start with 220-grit sandpaper and sand with the grain — never against it. The goal is to open the grain slightly so the sealer has something to bite into and to smooth out any roughness or mill marks. On wall planks, a light, even pass is enough.

Step 2: Clean and Dry Completely

Sanding creates fine dust that will get trapped under your finish if you don't remove it. Wipe down every surface with a tack cloth or a clean microfiber cloth slightly dampened with mineral spirits (for oil-based products) or plain water (for water-based). Let the wood dry completely before you open your sealer.

Step 3: Apply the First Coat

Apply your sealer with a high-quality brush, foam applicator, or lint-free cloth, depending on the product. Work in long, even strokes with the grain. Don't overload your brush — thin, even coats dry better and look better than thick, rushed ones.

Let the first coat dry fully according to the manufacturer's instructions.

Step 4: Light Sand Between Coats (320-Grit)

Once the first coat is completely dry, knock it back lightly with 320-grit sandpaper. This smooths out any dust nibs or brush marks and gives the second coat something to adhere to. Wipe away the dust with a tack cloth before moving on.

Step 5: Apply the Second Coat

Apply your second coat the same way as the first — even strokes, no overloading. Two coats is the standard recommendation for most interior wall applications.

Step 6: Optional Third Coat for High-Moisture Areas

If your wood is going in a bathroom, near a kitchen sink, or adjacent to a fireplace, a third coat is worth the extra time. Let each coat dry fully, and do a final very light sand with 400-grit before the last coat for a smooth finish.

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Already Sealed. Already Installed.

If you're still in the planning phase — you haven't bought your wood yet, and you're reading this trying to figure out whether the whole sanding-sealing process is something you want to take on — there's another path worth knowing about.

Stikwood planks are real wood. And they come pre-finished.

That means no raw wood to seal, no fumes, no sanding between coats, no waiting 24 hours between applications. The planks are peel-and-stick, so installation is something most people can do in an afternoon without tools, contractors, or mess.

"Totally transformed our fireplace...it looks amazing and gave us the redesign we wanted for a lot less. This is the 2nd time we've used Stikwood."

— Suzanne N., verified Stikwood customer

Browse the full Stikwood collection →

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Frequently Asked Questions

Do you need to seal wood wall planks?

It depends on whether the planks are raw or pre-finished. Raw, unfinished wood planks should always be sealed — bare wood absorbs moisture and stains easily and will show wear over time. Pre-finished planks (like Stikwood) don't require any additional sealing; the factory finish is already applied and ready to go.

What is the best sealer for interior wood walls?

For most interior wood walls, polycrylic is the best all-around choice. It dries clear (no amber tint), has low VOCs, and is easy to apply. It's ideal for light-colored wood species and won't yellow over time. Polyurethane is a stronger option for higher-traffic surfaces, but it's overkill for most wall applications and harder to work with.

How many coats of sealer does wood need?

Two coats is the standard minimum for interior wood walls. For high-moisture areas like bathrooms or kitchens, three coats provides meaningfully better protection. Always sand lightly between coats with fine-grit sandpaper (320-grit or finer) and let each coat dry completely before applying the next.

Can you use polyurethane on shiplap walls?

Yes — polyurethane works on shiplap walls. Water-based polyurethane is the better choice for shiplap, since it dries clear and doesn't add an amber tone that can shift the look of light-colored wood. For more on finishing shiplap, see our guide on how to finish shiplap edges.

How long does it take for wood sealer to dry?

Dry time varies by product type. Water-based sealers (polycrylic, water-based poly) are typically dry to the touch in 2–4 hours and ready for recoating in 4–6 hours. Oil-based polyurethane takes longer — usually 8–12 hours between coats and 24–48 hours for full cure. Always check the label and don't rush it.

Does Stikwood need to be sealed?

No — Stikwood planks come pre-finished from the factory. You don't need to apply any sealer, stain, or topcoat. They're ready to install straight out of the box.

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Ready to Skip Straight to the Good Part?

If sealing, sanding, and waiting on dry times sounds like more than you want to take on, Stikwood was built for exactly that. Real wood. Pre-finished. Peel-and-stick.

See the full collection at Stikwood.com →

Want to go deeper on wood wall finishing? Check out our guides on how to finish shiplap edges and what shiplap actually is — pros, cons, and where to use it.