Will Epoxy Stop Wood From Splitting?

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If you’re a woodworker or a DIY enthusiast, you’ve likely encountered the vexing problem of wood splitting. After searching for solutions and various products, you may have considered using epoxy as a potential fix.

As an experienced woodworking professional, I’m here to guide and provide insight into whether epoxy can indeed prevent wood from splitting its overall effectiveness in woodworking projects and beyond. 

Why Wood Cracks or Splits When Dried

Wood tends to crack or split as it dries, a natural occurrence due to the moisture within the wood evaporating, leading to shrinkage and contraction. This process induces stress within the wood fibers, potentially resulting in cracks or splits developing over time.

Does Epoxy Stop Splitting or Cracking on Wood?

Epoxy serves as an effective protective layer on wood, aiding in the reduction of splitting by reinforcing the surface. Nevertheless, it is crucial to understand that it cannot completely eliminate the possibility of wood splitting or cracking. 

Wood is an organic material, susceptible to changes in its dimensions with fluctuations in temperature and humidity, which can still lead to splits or cracks over time.

cracking and splitting wood

Advantages and Disadvantages of Applying Epoxy to Wood Splits

What i like

What I Don't Like

Effects of Using Epoxy on Wood

  1. Increased Strength
  2. Reduced Water Absorption
  3. Improved Appearance
  4. Increased Weight
  5. Difficulty in Modification

Is Epoxy Waterproof Enough to Prevent Splitting on Wood?

Epoxy is waterproof and can help prevent splitting on wood by reducing the wood’s ability to absorb water. However, it cannot entirely prevent the wood from splitting, as wood is a natural material that can still expand and contract due to changes in temperature and humidity. 

splitting wood treated with epoxy resin

While waterproof epoxy can provide additional protection to the wood and reduce the likelihood of splitting, it cannot entirely eliminate the possibility. 

How to Prevent Splitting on Wood Using Epoxy: Steps and Materials

What You’ll Need

Step #1: Clean and Smoothen the Surface

Start by sanding the surface to remove rough spots and splinters. Use a clean cloth to wipe away sawdust or debris, ensuring a smooth and bump-free surface for the epoxy application.

Step #2: Cover the Surrounding Areas With Tape

Protect the surrounding areas by covering them with high-quality painter’s tape. Press the tape firmly to prevent leaks or unwanted contact with the epoxy. 

use tape on wood

Step #3: Prepare the Epoxy Resin and Hardener Mixture

Follow the instructions on the epoxy resin and hardener packaging. Measure the required epoxy resin and hardener amounts in a clean mixing container. 

Thoroughly mix them together using a clean stirring tool or stick, following the recommended time and ratios provided by the manufacturer.

Step #4: Apply Tint

If desired, add a small amount of tint or dye to the epoxy mixture for added color. Mix the tint thoroughly until it is evenly distributed throughout the epoxy mixture.

Step #5: Apply the Epoxy on the Affected Areas

Using a clean brush or spatula, apply a thin layer of the epoxy mixture onto the cracks or splits in the wood. Ensure an even spread, covering all affected areas. Allow the epoxy to penetrate the wood fibers for approximately 30 minutes. If needed, apply a second layer.

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Step #6: Wait for it to Fully Dry and Cure

Follow the manufacturer’s instructions for the epoxy’s drying and curing time. Typically, the epoxy takes 24-72 hours to cure fully, depending on the brand and environmental conditions. During this time, keep the wood dry and well-ventilated, away from direct heat sources.

dry epoxy

Step #7: Smoothen the Surface

After the epoxy has fully cured, use sandpaper to smoothen the surface, removing any excess or uneven epoxy. 

Clean the surface with a damp cloth to remove any dust or debris, and allow it to dry completely. The wood should now be strengthened and protected from further splitting or cracking.

How Do You Fill Small Cracks in Wood With Epoxy?

Step #1: Clean the Surface

Begin by cleaning the small crack in the wood. Use a brush or cloth to remove any dust, dirt, or debris that may be present. This step ensures the crack is free from any loose particles that could affect the epoxy adhesion.

Step #2: Mask the Crack

To contain the epoxy within the crack, apply masking tape on both sides. The tape acts as a barrier, preventing the epoxy from spreading beyond the crack and onto the surrounding wood surface.

Step #3: Mix the Epoxy

Combine the epoxy resin and hardener in a mixing container according to the manufacturer’s instructions. Use a clean stirring tool or stick to mix the two components thoroughly. 

mixing Incredible Solutions Promise Epoxy 3-Gallon Kit of Deep Pour Pourable Plastic Up

Step #4: Apply the Epoxy

Using a small spatula, carefully apply the mixed epoxy to the crack. Fill the crack in the wood with epoxy completely, ensuring it penetrates deep into the fibers. 

Step #5: Sand the Surface

Using sandpaper to smoothen the surface after the epoxy has cured and hardened. Gently sand the area around the crack, blending it with the surrounding wood. 

Step #6: Remove the Tape

Once the epoxy has fully cured, carefully remove the masking tape from both sides of the crack. Slowly peel away the tape, being cautious not to damage the epoxy or the wood surface. The crack should now be filled with epoxy, providing strength and stability to the wood.

How Can I Strengthen Wood Using Epoxy?

Using epoxy is an effective way to strengthen wood and increase its resistance to cracking, splitting, and other forms of damage. Epoxy penetrates the wood fibers and creates a strong bond that reinforces the wood’s structure. 

applying TotalBoat Clear Penetrating Epoxy Wood Sealer Stabilizer to wooden board

To strengthen wood using epoxy, you must clean and prepare the surface, mix the epoxy resin and hardener, and apply the mixture to the wood. You can add reinforcing materials like fiberglass or carbon fiber cloth to increase the wood’s strength.

How Long Can Epoxy Last on Wood?

The lifespan of epoxy on wood depends on various factors, such as the quality of the epoxy, the type of wood, the environmental conditions, and how well the epoxy was applied. 

Generally, a high-quality epoxy applied correctly can last for several years or even decades on wood surfaces. 

How to Avoid Cracks or Splits on Wood

Tip #1: Keep it Away from Humidity

One effective way to avoid cracks or splits on wood is to keep it away from humidity and moisture as much as possible. Wood tends to expand and contract as the humidity levels fluctuate, which can cause stress on the fibers and lead to cracks or splits over time. 

air drying wood

So, storing wood in a dry place with good ventilation is important. Using a dehumidifier in areas with high humidity can also help to prevent moisture from affecting the wood.

Tip #2: Coat it With a Waterproof Finish or Sealer

Another effective way to avoid cracks or splits on wood is to coat it with a waterproof finish or sealer. This creates a protective layer that prevents moisture from penetrating the wood and causing damage. 

Many different types of finishes and sealers are available, including varnishes, lacquers, and oils.

Microporous Finishes

Microporous finishes are a type of wood finish that allows the wood to breathe while still protecting against moisture. These finishes are designed to allow water vapor to escape from the wood while preventing liquid water from entering. 

This is accomplished by using small pores in the finish that are too small for liquid water to pass through but large enough to allow water vapor to escape. 

staining with Olympic Maximum Wood Sealer For Decks

This can be particularly useful in humid or damp environments where moisture can easily accumulate. Microporous finishes are available in various forms, including paints, stains, and varnishes.

See Also: Will Bleach Stop Wood Rot?


Epoxy will stop the wood from splitting and cracking, but it has limitations. Other methods, such as waterproof finishes and avoiding humidity [1], can help too. 

Moreover, it is vital to weigh the pros and cons of using epoxy. By employing the right methods and paying attention to detail, you can maintain the wood’s aesthetic appeal and functionality for an extended period.  

Robert Johnson is a passionate furniture maker & carpenter, sought after for his knowledge on the craft.
You've probably seen his down-to-earth wisdom in USA Today, Bobvila, Family Handyman, and The Spruce, where he has shared commentary and guidance on various woodworking topics.

Robert is the brain behind Sawinery, where he aims to share tips, tricks, and a passion for all things carpentry.
Robert Johnson

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