how to seal a redwood deck

Seal Redwood Deck: Ultimate Guide

By Joshua HarrisJanuary 3, 2026

Embarking on a redwood deck sealing project? You're in the right place. Redwood, known for its durability and natural beauty, requires a specific approach to ensure a long-lasting, weather-resistant seal. Let's dive into the step-by-step process of how to seal a redwood deck, optimizing its lifespan and enhancing its aesthetic appeal.

Before we begin, it's crucial to understand that redwood contains natural oils and tannins that protect it from decay and insects. However, these oils can interfere with the adhesion of some sealers. Thus, we'll focus on methods that respect redwood's unique characteristics and provide a robust seal.

Preparation: Readying Your Redwood Deck

Preparation is key to a successful sealing project. Begin by inspecting your redwood deck for any signs of damage, such as splinters, cracks, or rot. Address these issues promptly to ensure a smooth sealing process and prolonged deck life.

Next, clean your deck thoroughly. Remove any dirt, debris, or mildew using a deck cleaner or a solution of water, bleach, and detergent. Allow the deck to dry completely before proceeding. This step ensures that the sealer adheres evenly and effectively.

Sanding: Smoothing the Surface

Sanding your redwood deck is crucial for two reasons: it removes any remaining mill glaze (a thin, waxy layer that can prevent sealant absorption) and smooths out the surface for a uniform seal. Use a power sander with 80-grit sandpaper, working in the direction of the grain. Be sure to wear appropriate safety gear, including a dust mask and goggles.

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After sanding, wipe the deck with a damp cloth to remove any residual dust. Allow the deck to dry completely before moving on to the next step. This typically takes 24-48 hours, depending on weather conditions.

Choosing the Right Sealer: Compatibility is Key

Selecting the right sealer is vital for preserving your redwood deck's natural beauty and protecting it from the elements. Opt for a water-repellent sealer designed for redwood, such as a penetrating oil sealer or a clear, water-based acrylic sealer. These sealers respect redwood's natural oils and provide a durable, long-lasting barrier against moisture and UV damage.

Steer clear of solvent-based sealers, as they can damage redwood's natural oils and cause the wood to dry out and crack over time. Additionally, avoid sealers with pigment, as they can alter redwood's natural color and appearance.

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Application: Sealing Your Redwood Deck

Now that your redwood deck is clean, smooth, and dry, it's time to apply the sealer. Ensure you have a clear, calm day with no rain or high humidity in the forecast. This allows the sealer to penetrate and cure properly.

Before you begin, lay down drop cloths or plastic sheeting to protect adjacent surfaces from spills or drips. Also, have a stiff-bristled brush, a roller with a long nap cover, and gloves ready for application.

Applying the Sealer: Brush and Roll

Start by applying the sealer to the deck's railings and balusters using a stiff-bristled brush. This ensures that you reach all nooks and crannies, providing even coverage and protection. Work in small sections to prevent the sealer from drying out before you can apply a second coat.

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Once the railings are sealed, move on to the deck's surface. Using a roller with a long nap cover, apply the sealer in even, overlapping strokes, working in small sections. Ensure that the sealer penetrates the wood evenly, allowing it to protect against moisture and UV damage. Allow the first coat to dry according to the manufacturer's instructions before applying a second coat.

Inspect and Reapply: Ensuring Optimal Protection

After the second coat has dried, inspect your redwood deck for any missed spots or areas that require additional attention. Touch up these areas as needed to ensure comprehensive protection.

In general, redwood decks require re-sealing every 2-3 years, depending on weather conditions and exposure to sunlight. Regularly inspect your deck for signs of wear or damage, and reapply the sealer as needed to maintain its longevity and beauty.

Congratulations! You've successfully sealed your redwood deck, optimizing its lifespan and enhancing its natural charm. By following these steps and maintaining your deck regularly, you'll enjoy countless memories and moments on your well-protected, beautiful outdoor space. Happy sealing!