How to Seal Wood Slices

Sealing wood slices is an essential step to preserve their natural beauty and prevent cracking or warping over time. Whether you’re using them for home décor, crafting, or as functional pieces, proper sealing ensures durability and maintains the integrity of the wood. This guide will walk you through the key steps of how to seal wood slices.

What Are Wood Slices?

Wood slices are thin, round pieces of wood that are typically cut crosswise from tree trunks or branches. These slices showcase the natural rings of the wood, offering a unique and rustic aesthetic. They come in various sizes, depending on the diameter and thickness of the branch or trunk from which they are cut. Wood slices are versatile and widely used for projects such as coasters, ornaments, plates, or decorative bases. Their organic charm makes them a popular choice for crafting, home décor, and even wedding decorations.

Why Sealing Wood Slices is Important

Sealing wood slices is crucial for maintaining their quality and appearance over time. Wood is a natural material that is prone to absorbing moisture from the environment, which can lead to cracking, warping, or even rotting. By sealing the surface, you create a protective barrier that prevents these issues and enhances the wood’s longevity. Additionally, sealing helps to bring out the wood’s natural grain and color, adding to its aesthetic appeal. This process is especially important if the wood slices are being used in areas with fluctuating humidity or temperature, ensuring they remain a stable and durable part of your project.

10 Methods How to Seal Wood Slices

1. Dry the Wood Slices Properly Before Sealing

Before applying any sealing product, the wood slices must be fully dried, as moisture within the wood can cause cracks, mold, or poor adhesion of the sealant. Drying can be done naturally by placing the slices in a well-ventilated, shaded area for several weeks or months, depending on the thickness.

Alternatively, you can use a kiln or an oven at a low temperature to speed up the process. Place the slices in a single layer with airflow on all sides. Use a moisture meter to ensure that the slices are below 10% moisture content. Attempting to seal damp wood is a common mistake and can lead to sealing failure down the line.

2. Sand the Surface Smooth for Better Sealing

Sanding is a crucial preparatory step that smooths the wood surface, opens the pores, and ensures a strong bond with the sealing product. Begin with coarse sandpaper (such as 80-grit) to remove any roughness or saw marks. Progress to finer grits (150 to 220) to create a silky finish. For wood slices that will be displayed or used in crafts, this smoothness greatly enhances both appearance and sealant performance. Use a sanding block or orbital sander for consistency and take care to sand the edges and bark gently to preserve the natural look.

3. Use Polyurethane for a Durable, Glossy Finish

Polyurethane is one of the most common and effective wood sealants, offering a durable finish with options for matte, satin, or glossy sheens.

Apply a thin, even coat of oil-based or water-based polyurethane using a foam brush or a lint-free cloth. Let it dry for several hours, then sand lightly with a fine-grit sandpaper before applying a second or third coat. Oil-based polyurethane provides a warmer tone and greater durability, while water-based dries faster and stays clear over time. This method works particularly well for coasters, centerpieces, and ornaments that require both beauty and resilience.

4. Seal with Epoxy Resin for a Glass-Like Finish

For wood slices that demand a clear, thick, glossy surface—such as tabletops or decorative wall pieces—epoxy resin is an excellent choice. Mix a two-part epoxy according to the manufacturer’s instructions and pour it over the wood slice on a level surface. Use a torch or heat gun to remove bubbles, and allow it to cure undisturbed for at least 24–48 hours. Epoxy not only seals the wood but also enhances the natural grain dramatically.

It is waterproof and ideal for items exposed to moisture, though it must be applied in a dust-free environment to avoid imperfections.

5. Apply Linseed Oil for a Natural, Matte Finish

If you prefer a more natural, rustic look with minimal shine, linseed oil is a traditional choice that penetrates deeply into the wood fibers. Boiled linseed oil dries faster than raw and is more commonly used for wood finishing. Apply a generous amount with a cloth or brush, let it soak in for about 15–30 minutes, and then wipe off the excess. Repeat this process over several days for a richer finish. While it’s not as protective as polyurethane, linseed oil nourishes the wood and brings out a warm, amber hue in the grain.

6. Use Wood Stabilizer to Prevent Cracking

For freshly cut or green wood slices that are still drying, applying a wood stabilizer or pentacryl can help reduce internal stress and prevent future cracks. These solutions penetrate deep into the wood and displace moisture, then solidify as the wood cures. Apply the stabilizer using a brush or by soaking the wood slices for a few days, then allow them to dry slowly in a cool, shaded area. This method is especially useful for preserving round log cross-sections with visible tree rings, ensuring they stay intact as they dry.

7. Apply Shellac for a Vintage-Looking Finish

Shellac is a natural resin dissolved in alcohol, favored for its ease of use and classic amber tone. It dries quickly and imparts a beautiful sheen that enhances wood grain. Apply shellac with a pad, brush, or cloth in thin coats, allowing each to dry for 30 minutes before lightly sanding and applying another. While shellac is not as durable as polyurethane, it’s perfect for decorative or indoor applications where warmth and charm are desired. It also pairs well with wax for added depth and luster.

8. Use Spar Urethane for Outdoor Wood Slices

If your wood slices will be used outdoors—as in garden markers, rustic signage, or patio décor—spar urethane is the go-to sealer. It’s formulated to resist UV rays, moisture, and temperature swings. Apply it with a high-quality brush in long, smooth strokes, and let each coat dry thoroughly before applying the next. You’ll typically need 3–4 coats for full protection. This method ensures your wood slices remain intact and vibrant despite the elements. For best results, seal both sides and the bark edge to prevent uneven moisture absorption.

9. Seal the Bark to Prevent Shedding

One unique challenge with wood slices is preserving the bark, which can flake off over time. To stabilize it, gently brush away any loose debris, then apply a thin layer of clear wood glue or diluted polyurethane along the bark edge using a small brush. You can also use a sealant spray to avoid disturbing the texture. Let it dry completely before handling. This method works particularly well for decorative slices where the bark adds visual interest and authenticity. Sealing the bark not only improves appearance but also prevents mess and decay.

10. Finish with Paste Wax for Soft Luster

Once your primary sealant has dried and cured—whether polyurethane, oil, or shellac—you can add a final layer of paste wax for a soft, velvety finish. Apply the wax in circular motions with a soft cloth, allow it to haze, then buff it to a shine. This method gives the surface a rich, tactile feel and enhances depth in the wood grain. Paste wax is ideal for decorative wood slices such as ornaments, trays, or art pieces, though it’s less water-resistant than other finishes. Reapply wax every few months to maintain the sheen.

Things to Consider When Working with Wood Finishes

Surface Preparation

Proper surface preparation is key to achieving a smooth and even finish. Sand the wood thoroughly, working through progressively finer grits of sandpaper, and ensure the surface is clean and free of dust before applying any finish. 

Type of Finish

Different types of finishes serve different purposes. Consider factors such as durability, water resistance, and the desired appearance of the final product when selecting between options like polyurethane, oil-based finishes, or shellac. 

Application Method

The application method plays a significant role in the outcome. Some finishes are best applied with brushes, while others might require rags or even sprayers. Follow the manufacturer’s recommendations and test on a scrap piece of wood if possible. 

Curing Time

Allow adequate time for each coat to dry and cure properly. Rushing this process can result in uneven layers or poor adhesion, affecting the longevity of the finish. 

Environmental Factors

Conditions such as temperature, humidity, and ventilation can influence how a finish dries and cures. Work in a well-ventilated space with suitable environmental controls for the best results. 

Conclusion

Sealing diy wood slice ornaments is a rewarding process that both preserves their natural beauty and prepares them for long-term use in crafts, furniture, or art. Whether you’re going for a rustic, matte appearance with oils or a durable, glossy surface with polyurethane or epoxy, the method you choose should align with how and where the wood slices will be used.

By preparing the surface properly and selecting the right sealing product, you ensure that your wood slices remain beautiful, intact, and functional for years to come. Thanks for reading our blog post on how to seal wood slices! We hope you found it helpful and informative.