Epoxy Resin UV Resistance

Epoxy Resin UV Resistance CHILL EPOXY

Epoxy Resin UV-Resistance, how does it work?

Epoxy resin is a versatile and durable material that is widely used in various industries, from construction to crafting. However, one of the most common problems with epoxy resin is its susceptibility to UV damage, which can cause yellowing and discoloration over time. To combat this issue, many manufacturers have introduced epoxy systems with UV resistance. However, not all UV-resistant epoxy resins are created equal. In this article, we’ll take a closer look at epoxy resin UV resistance, including how UV damage occurs, how to protect your epoxy projects, and why only premium epoxy systems with quality raw materials will offer real UV resistance.

The Truth About Epoxy Resin UV Resistance: Why Only Premium Epoxy Systems Will Offer Real Protection

Epoxy resin can yellow over time due to a variety of factors, including UV exposure and chemical degradation. One of the main causes of yellowing in epoxy resin is exposure to UV light. Even though epoxy resin has good UV resistance, it is not completely immune to the effects of UV radiation. Prolonged exposure to UV light can cause epoxy resin to yellow and become brittle, leading to reduced performance and potential failure.

In addition to UV exposure, epoxy resin can also yellow due to chemical degradation. This can occur when the resin is exposed to certain chemicals or environmental conditions that cause it to break down over time. For example, epoxy resin may yellow when exposed to high temperatures, moisture, or other harsh conditions.

To minimize the risk of yellowing, it is important to store and use epoxy resin in accordance with the Polymeres Technologies‘s recommendations. This may include storing the resin in a cool, dry place, protecting it from UV light, and avoiding exposure to harsh chemicals or environments.


As you may know, UV rays are very aggressive and can easily damage any epoxy giving time. Direct sunlight in particular is extremely harmful for the molecular structure. The main reason is that the molecular structure will absorb those UV rays acting as a defense barrier. This molecular structure will give the epoxy hardness, durability and hardness to cured epoxy resin and cannot be substituted. Epoxy under overexposure will begin to change colour due to oxidation of molecules and start losing its initial appearance. If not stabilized by the quality of its raw materials the yellowing will start faster.

Although it is currently not possible to completely stop the yellowing of the molecules caused by UV light, it is possible to slow down the epoxy’s oxidation process significantly. Polymeres Technologies chemistry team came up with a protection approach based on using specific premium raw materials. This effective but expensive formulation helps our products to resist yellowing longer unlike convenience brands. When we talk about the chemistry of molecules and their resistance to UV, it is well known that certain high-end materials offer better resistance.

In conclusion, by combining certain specific raw materials and crosslinking them to the molecular structure of our state-of-the-art systems offer a better resistance to the devastating effect of UV rays. Those formulations are capable of reducing slowing down the effects of the sun.

Does UV Damage Epoxy Resin?

UV damage is one of the most common problems associated with epoxy resin. When exposed to UV light, epoxy resin will undergo a chemical reaction known as photodegradation. This reaction causes the resin to break down and lose its mechanical properties, resulting in yellowing and discoloration.

How do you Protect Epoxy Resin From UV Light?

To protect epoxy resin from UV light, it’s important to use a high-quality, UV-resistant epoxy system. These systems are formulated with special raw materials that can withstand UV damage and prevent yellowing and discoloration. In addition, you can also protect your epoxy projects by keeping them away from direct sunlight.

Polyspartic Epoxy Resin for Exterior Applications

Polyspartic epoxies are a type of resin that has unique properties that make it a better option for exterior applications compared to other types of coatings, including epoxy.

Firstly, polyspartic coatings have superior UV resistance compared to epoxy coatings. They contain a unique polyaspartic ester polymer that is highly resistant to the damaging effects of UV light, and can maintain its clarity and color for much longer. This makes them a better option for outdoor applications that are exposed to sunlight, such as concrete patios or exterior walls.

Secondly, polyspartic coatings have a faster curing time compared to epoxy. They can cure in as little as 1-2 hours, which is significantly faster than the 24-48 hour cure time of epoxy coatings. This makes them ideal for outdoor projects that require a quick turnaround time, such as commercial buildings or parking garages.

Is epoxy resin OK outdoors?

Epoxy resin can be used outdoors, but it’s important to choose the right epoxy system for the job. For example, epoxy systems formulated for exterior use will have different properties than those designed for interior use. In addition, it’s important to protect your epoxy projects from direct sunlight and other weather conditions to prevent yellowing and other types of damage.

How long will epoxy last outdoors?

The lifespan of epoxy resin outdoors will depend on various factors, such as the quality of the epoxy system, the type of environment it’s exposed to, and the level of UV exposure. In general, a high-quality, UV-resistant epoxy system can last for several years with proper care and maintenance. However, it’s important to monitor your epoxy projects regularly and reapply coatings or sealants as needed to prevent damage.


Q: Can you reverse the effects of UV damage on epoxy resin?

A: Unfortunately, once epoxy resin has undergone UV damage, it cannot be reversed. However, you can prevent further damage by using a UV-resistant epoxy system and protecting your projects from UV light.

Q: What are the best practices for maintaining epoxy projects outdoors?

A: To maintain epoxy projects outdoors, it’s important to regularly inspect them for signs of damage and reapply coatings or sealants as needed. In addition, you should avoid exposing them to direct sunlight and other weather conditions.

Q: Can epoxy resin be used for outdoor applications like patio furniture or boat decks?

A: Yes, epoxy resin can be used for outdoor applications, but it’s important to choose an exterior-grade epoxy system and protect your projects from weather conditions to prevent yellowing and other types of damage.


Epoxy resin is a popular and versatile material that can be used in various industries and applications. However, UV damage is a common problem that can cause yellowing and discoloration over time. To protect your epoxy projects from UV damage, it’s important to use a high-quality, UV-resistant epoxy system and take proper precautions to avoid direct sunlight and other sources of UV light. By choosing a premium epoxy system with quality raw materials



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