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Avoid These 7 Common Mistakes When Applying Epoxy on Wood

Updated: Dec 12, 2023

Wood is a versatile and beautiful material that can be enhanced with the application of epoxy resin. Epoxy is a durable and glossy coating that can protect wood surfaces while adding a stunning finish. However, achieving a flawless result requires careful preparation and application. In this blog post, we will discuss seven common mistakes to avoid when applying epoxy on wood to ensure a successful outcome.

Epoxy on Wood

Epoxy is a two-part adhesive product that consists of a resin and a hardener. When mixed together, these components create a chemical reaction that results in a strong and durable coating. Epoxy is commonly used to seal and protect wood surfaces, such as tabletops, countertops, and furniture. It provides a glossy and smooth finish that enhances the natural beauty of the wood while protecting it from moisture, scratches, and UV damage.

Pro tip: Don't use epoxy resin as a surface for a cutting board

Importance of Proper Preparation

Before applying epoxy on wood, proper preparation is crucial. This includes cleaning the surface thoroughly to remove any dirt, dust, or oils that could interfere with the adhesion of the epoxy. Additionally, it is essential to ensure the wood is dry and free from moisture. Moisture trapped beneath the epoxy can cause bubbling, cloudiness, or adhesion issues. Taking the time to prepare the wood surface properly will ensure a smooth and flawless epoxy application.

Common Mistake #1: Not Sanding the Wood Properly

One of the most common mistakes when applying epoxy on wood is not sanding the surface properly. Sanding the wood helps to create a rough texture, allowing the epoxy to adhere better. It also helps to remove any existing finish or imperfections on the wood. Failing to sand the wood adequately can result in poor adhesion, uneven coverage, or peeling of the epoxy coating over time. Therefore, it is essential to invest time in sanding the wood to ensure a strong bond between the wood and the epoxy.

Common Mistake #2: Applying Epoxy in Humid Conditions

Humidity can significantly affect the outcome of an epoxy application. When epoxy is applied in high humidity conditions, it can trap moisture in the coating, leading to cloudiness, bubbles, or a sticky finish. To avoid these issues, it is crucial to choose a day with low humidity levels for epoxy application. If the humidity is unavoidable, using a dehumidifier or air conditioning to control the environment can help create optimal conditions for epoxy curing.

One source recommended to avoid applying mixed epoxy at a relative humidity of more than 90%

It's also important to remember that wood is a porous material that can trap moisture. Even on a dry day, the epoxy application can still produce a cloudy result if the wood is still holding moisture. Steps should be taken to dry out the wood sample as much as possible before epoxy is applied.

Common Mistake #3: Using the Wrong Type of Epoxy

Not all epoxy products are suitable for wood applications. Using the wrong type of epoxy can result in poor adhesion, discoloration, or a hazy appearance. It is essential to choose an epoxy specifically designed for wood surfaces. These epoxy products are usually flexible, UV resistant, and have a longer open time to allow for easier application. Researching and selecting the right epoxy product for your wood project will ensure a successful outcome.

Pro tip: Some epoxy products are built for deep fills while others are built for a thin surface layer. Make sure you research the correct epoxy for your application. Problems such as foaming can arise if you use the wrong epoxy product for your wood sample.

Common Mistakes When Applying Epoxy on Wood
A thick fill creating foam as it cures

Common Mistake #4: Applying Epoxy Too Thick or Too Thin

Achieving the right thickness when applying epoxy is crucial for a professional finish. Applying epoxy too thick can result in air bubbles, uneven curing, or a yellowish appearance. On the other hand, applying epoxy too thin may not provide adequate protection or coverage. Following the manufacturer's directions regarding the recommended thickness and application techniques will help you achieve the desired results.

Common Mistake #5: Not Properly Mixing the Epoxy Components

Properly mixing the epoxy components is essential for a successful application. Incomplete mixing can result in a sticky or tacky finish, uneven curing, or poor adhesion. To ensure thorough mixing, use separate mixing containers for the resin and hardener, and follow the directions for the recommended mixing ratios and times provided by the manufacturer. Take your time and mix the components thoroughly to achieve a homogenous mixture before applying it to the wood surface.

Pro Tip: It is also possible to trap air if the epoxy is mixed too aggressively, which can produce a cloudy finish or result in bubbles trapped in the epoxy. Be careful to mix resin and hardener components slowly and carefully.

Common Mistake #6: Not Applying a Seal Coat Before Pouring Epoxy

Applying a seal coat before pouring epoxy is a crucial step in preventing air bubbles from forming in the epoxy surface. A seal coat is a thin layer of epoxy that is applied to the wood surface before pouring the main epoxy layer. This seal coat helps to seal the wood pores and prevents the epoxy from being absorbed into the wood, which can lead to bubbles or an uneven finish. Taking the time to apply a seal coat will result in a smoother and more professional-looking epoxy surface.

Common Mistake #7: Rushing the Curing Process

Patience is key when working with epoxy on wood. Rushing the curing process by applying heat or exposing the epoxy to direct sunlight can lead to cracking, discoloration, or an uneven finish. It is essential to follow the manufacturer's recommended curing time and temperature guidelines. Allow the epoxy to cure in a controlled environment, away from direct heat sources or sunlight. Taking the correct amount of time to allow the epoxy to fully cure will ensure a durable and long-lasting finish.

Tips for Successful Epoxy Application on Wood

To achieve a successful epoxy application on wood, here are some additional tips to consider:

1. Read and follow the manufacturer's directions and recommendations. 2. Work in a well-ventilated area to avoid inhaling epoxy fumes. 3. Use proper personal protective equipment, such as gloves and safety goggles. 4. Apply multiple thin layers of epoxy rather than one thick layer for better results. 5. Remove any dust or debris that may settle on the epoxy surface during the curing process. 6. Consider using a heat gun or torch to remove air bubbles that may form on the epoxy surface. 7. Protect the epoxy surface from excessive heat, sharp objects, or harsh chemicals to maintain its longevity.


Applying epoxy on wood can transform ordinary surfaces into stunning works of art. By avoiding these common mistakes and following the tips outlined in this blog post, you can achieve a flawless epoxy application on wood. Proper preparation, selecting the right epoxy, and taking the time to apply and cure the epoxy correctly will result in a beautiful and durable finish that will enhance the natural beauty of the wood for years to come. So, roll up your sleeves, follow these guidelines, and enjoy the process of creating your epoxy masterpiece on wood.

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