DALL·E 2023 06 14 12.17.21 4 round samples of epoxy resin with each one turning more yellow the first sample is to be clear

Why Does Epoxy Resin Turn Yellow?

The transformation of crystal-clear cured epoxy resin into a yellow hue can be disheartening and compromising the aesthetic appeal of carefully crafted projects. As an expert in the field, I understand the frustration this can cause and the importance of unraveling the mystery behind cured epoxy resin turning yellow.

In this article, we delve into the factors contributing to the yellowing of epoxy and equip you with preventive measures to preserve its original clarity.

By understanding the underlying causes and implementing effective strategies, you can maintain the vibrant beauty of your resin creations for years to come.

Don’t let the passage of time tarnish your artistic endeavors. Let’s dive into the fascinating world of resin and uncover the secrets to preserving its brilliance, ensuring your creations remain timeless and captivating.

Understanding Epoxy Resin

Craftsmen and artists alike are drawn to epoxy resin for its ability to transform ordinary objects into stunning works of art. From jewelry and furniture to decorative pieces and sculptures, epoxy resin provides a glossy, glass-like finish that enhances the visual appeal of any project.

One of the most notable characteristics of epoxy resin is its remarkable clarity.

When properly mixed and cured, it produces a crystal-clear surface that accentuates the colors and textures of embedded elements. This transparency allows for the creation of visually captivating designs and lends an air of sophistication to the finished piece.

Durability is another key attribute of epoxy resin. Once cured, it forms a strong and resilient surface that can withstand daily use and wear. This makes epoxy resin an ideal choice for high-traffic areas, such as tabletops, countertops, and flooring. Its resistance to scratches, stains, and impact ensures longevity and preserves the pristine condition of the project.

The versatility of epoxy resin is unparalleled.

It can be pigmented with various dyes and pigments to achieve a wide spectrum of vibrant colors and captivating effects. Additionally, clear resin can be combined with other materials like wood, metal, or natural elements to create striking visual contrasts and unique textures.

To ensure optimal results and longevity, it is crucial to use high-quality epoxy resin. Choosing a non-yellowing epoxy resin is of utmost importance, as it minimizes the risk of the material turning yellow over time.

High-quality resins are formulated with additives that resist the effects of UV radiation, heat, and moisture, preserving the clarity and transparency of the cured resin.

I have found that one of the best places to buy epoxy resin supplies and resins that resist yellowing is from the online store


By understanding the inherent qualities of epoxy and selecting the appropriate resin for your project, you set the stage for the creation of stunning, long-lasting pieces.

Factors Contributing to Resin Yellowing

UV Exposure

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Epoxy resins, while stunning in its initial clarity, is highly susceptible to the degrading effects of ultraviolet radiation (UV light).

When exposed to prolonged sunlight or artificial UV light sources, the molecular structure of epoxy resin undergoes a process known as photodegradation.

This process causes the epoxy resin turns yellow and to break down, resulting in discoloration and a noticeable yellowing effect over an extended period of time.

To combat the yellow discoloration caused by UV light exposure, preventive measures can be taken.

UV-resistant additives and coatings are available in the market, specifically designed to protect epoxy resin from the harmful effects of UV radiation. These additives and epoxy coatings can act as a barrier, absorbing or reflecting the UV rays before they can reach the resin.

By incorporating UV-resistant additives during the mixing process or applying a UV-resistant topcoat, you can significantly prolong the clarity and color stability of your epoxy resin projects.


Heat is another factor that can accelerate make epoxy turn yellow. Excessive heat can cause the resin to undergo thermal degradation, leading to color changes. High-temperature environments and light exposure, such as direct sunlight or exposure to unsuitable environments sources, can exacerbate this effect.

Avoid exposing the resin to extreme heat during the curing phase and in its cured state. Additionally, consider the placement of epoxy resin projects, ensuring they are not in direct sunlight or near sources of heat, such as radiators or hot appliances.

Moisture and Oxygen

Moisture and oxygen play a significant role in the yellowing and degradation of epoxy resin over time.

When exposed to moisture and oxygen, epoxy resin undergoes chemical reactions that result in discoloration and a yellowed appearance.

These oxidation reactions can occur during the curing process or after the resin has fully cured.

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Contaminants and Improper Mixing

Contaminants and improper mixing techniques can also contribute to epoxy resin turning yellow. Dust, dirt, and other impurities present in the working environment can become trapped in the resin during the mixing process, leading to discoloration and a yellow appearance.

Additionally, inadequate mixing of the resin and the epoxy hardener can result in uneven curing, causing variations in color and transparency.

Follow proper mixing techniques, thoroughly combining the resin and hardener according to the manufacturer’s instructions.

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Preventive Measures

UV stabilizers and additives

First and foremost, incorporating UV stabilizers and additives during the resin mixing process or applying a UV light -resistant topcoat provides an effective defense against yellowing discoloration caused by continuous exposure UV light.

These additives act as a shield, absorbing or reflecting harmful UV light rays before they can degrade the resin.

Additionally, opting for epoxy resin products that come with built-in UV light stabilizer protection can provide an added layer of defense, ensuring long-lasting clarity and color stability.

Temperature control

Temperature control is another crucial aspect to consider. Adhering to the recommended heat range during the curing process helps mitigate the discoloration effects of heat.

Avoid subjecting cured resin projects to extreme or high temperatures, as this can accelerate the yellowing process.

Proper storage

Proper storage is essential in preventing yellowing caused by moisture and oxygen. Always store your epoxy resin in a dry, airtight container when not in use.

This prevents the resin from coming into direct contact with moisture and oxygen, which can trigger chemical reactions and result in discoloration.

manufacturer’s guidelines

Lastly, always follow the manufacturer’s guidelines for epoxy resin application, maintenance and most importantly safety precautions.

Manufacturers provide specific instructions regarding mixing ratios, curing times, and recommended environmental conditions.

By implementing these preventive measures, you can significantly reduce the likelihood of epoxy resin yellowing and maintain the beauty and integrity of your projects.

Troubleshooting and Restoration

While prevention and cure is key, the yellow discoloration may still occur in epoxy projects despite your best efforts. Let’s address some common issues and explore tips for troubleshooting and restoring yellowed epoxy.

When yellow discoloration happens on clear resin, one option for restoration is to sand the surface gently. Start with a low-grit sandpaper and gradually progress to finer grits to remove the discolored layer. Follow up with polishing compounds to restore the resin’s clarity and shine.

This process can help eliminate surface-level yellow discoloration and bring back the original luster of your project.

In some cases, recoating the yellowed coating with epoxy can be an effective solution. Applying a fresh layer of non-yellowing resin over the yellowed surface can provide a renewed appearance and enhance the overall aesthetics.

Ensure proper surface preparation and follow the manufacturer’s instructions for application and curing.

For complex restoration projects or instances where yellow discoloration has deeply penetrated the resin, seeking professional advice is recommended.

Experienced professionals can assess the extent of damage and employ advanced techniques to restore the resin to its original beauty.

Remember, each restoration process may vary depending on the specific project and the severity of the yellow discoloration. Take your time, exercise caution, and test any restoration methods on a small, inconspicuous area before proceeding with the entire project.

By troubleshooting and restoring yellowed epoxy resin, you can revive your creations and reclaim their visual appeal. In the final section, we will summarize the key points discussed in this article and offer closing thoughts on preserving the clarity and longevity of epoxy resin.

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Will all epoxy resin turn yellow over time?

While epoxy resin is prone to going yellow through exposure to UV light, not all epoxy resin will turn yellow. High-quality, non-yellowing epoxy resins specifically formulated for crafts and coatings are available. These epoxies are designed to resist yellowing and maintain their clarity and color stability over time. It’s important to choose a reputable brand and check for non-yellowing properties when selecting epoxy resin for your projects.

How can I prevent epoxy from turning yellow?

To prevent yellowing, consider incorporating UV light-resistant additives during the mixing process or applying a UV light-resistant topcoat. Control the curing environment, store the resin in a dry, airtight container, maintain a clean working environment, and follow manufacturer guidelines.

Can yellowed epoxy be restored?

Yes, yellowed epoxy can be restored. Techniques such as sanding and polishing can help remove surface-level discoloration. Recoating the resin with a fresh layer of non-yellow resisting epoxy can also restore its appearance. For complex restoration projects, seeking professional advice is recommended.

How long does resin typically last before turning yellow?

The longevity of epoxy resin varies depending on various factors such as UV exposure, and environmental conditions. By using high-quality resin and implementing preventive measures, you can extend its lifespan and delay discoloration.


understanding why epoxy turns yellow is crucial for achieving long-lasting, visually stunning results in your projects. By addressing factors that yellow, such as exposure to UV light, heat, moisture, contaminants, and improper mixing, you can proactively prevent yellowing and maintain the resin’s clarity.

With proper care, high-quality epoxy, and adherence to preventive measures, you can create captivating, non-yellowing resin projects that stand the test of time. Embrace the versatility and beauty of resin while maintaining its pristine appearance. Let your creativity shine through with epoxy resin creations that truly make a lasting impression.

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