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Here’s Why an Epoxy Floor Turns Yellow and How You Can Prevent It

July 19, 2021


Epoxy is considered the best garage flooring option due to its shiny finish, durability, and cost-effectiveness. Furthermore, it is stain-resistant, moisture-proof, installs quickly, and has a longer lifespan. Homeowners with epoxy floors also enjoy the ease of maintenance and its ability to withstand high traffic and cover defects. It is steadily growing in popularity for both residential and commercial applications.

What is epoxy floor coating?

Epoxy floor coating is constructed by mixing industrial-grade resins and hardeners, which take a few days to solidify and turn into a hard and stiff plastic floor. It is applied on a prepared and smooth concrete flooring surface in multiple layers, and each layer is allowed to harden before applying the subsequent layers. 

However, despite all its benefits, several people notice their epoxy floors turn yellowish over time. 

It can happen at any time, ranging from a few months to a few years after application. Although it is not concerning and does not indicate any problem or degradation, it is disheartening for homeowners to see their shiny floors turn yellow. We invite you to keep reading to understand why it happens and ways to prevent or slow down this yellowing process.

Reasons why an epoxy floor coating turns yellow

Epoxy turning yellowish or amber is a natural phenomenon commonly seen in most forms of epoxy resins. However, this process usually has no impact on the coating performance of the garage floors. It is generally the result of a chemical reaction due to prolonged or continuous exposure to various environmental factors. Flooring constructed using old resin materials can quicken the discoloration process. Let us look at the main reasons behind epoxy discoloration:

UV light

Prolonged exposure to direct or indirect sunlight is the most common reason for epoxy floor coating turning yellow. The longer the UV light exposure, the more significant is the damage. It usually happens at the front of the garage or in areas receiving sunlight through windows. The phenomenon is known as ambering, and it speeds up the process of polymer degradation. Cracking, chalking, and gloss reduction are some other effects of UV light exposure on the coating. 

High temperatures

Exposure to extremely high temperatures over an extended period can discolor the epoxy resins. Though it is not very common, it can happen if the garage has an uncontrolled environment.


Epoxy floor coating is water and moisture resistant. However, when epoxy resin is exposed to water regularly or left in a high moisture environment for longer, it can cause discoloration.

How to prevent discoloration in epoxy garage floor coating

Garage owners need to stay proactive to slow down or entirely prevent the process of epoxy yellowing. Here are a few ways to stop the yellowing process:

  • Use a clear and aliphatic (non-yellowing) UV-resistant sealing agent to coat the flooring. Clean the surface thoroughly before its application. 

  • Avoid keeping the garage door open for long durations. 

  • Choose epoxy resin colors that can mask discoloration, like yellow-pigmented shades, including green or dark colors like black.

  • Be careful not to use acidic or soap-based cleaners.

Install and maintain your custom epoxy floor

Contact a local epoxy garage floor expert for high-quality garage floor installation. They will also share more info about epoxy coating and other helpful tips to prevent discoloration.

Quick Response Garage Floor Coating offers epoxy, flake, solid, stain, and specialty flooring options to Phoenix Valley residential and commercial clients. Call us today for a free estimate at (602) 428-8626.

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