Humidity on Epoxy Resin Projects

Find Out the Effects of Humidity on Epoxy Resin Projects

Apr 11, 2024

Have you ever wondered how humidity can affect your epoxy resin projects? The material reacts with moisture in the air, which can lead to a few problems like a cloudy finish and air bubbles. It leads to issues such as bubbles, cloudiness, or even a lack of curing. In this blog, we will explore the various tips to work with this phenomenon as it can affect your art projects and provide some ways how to control its effects. If you wish to learn this art form in detail, we recommend joining a resin art workshop

Understanding the Concept of Humidity

It refers to the amount of moisture in the air. It is typically measured as a percentage. A high percentage of it means there is a lot of moisture in the air, while a low percentage indicates dry air. Moisture messes with the cure and leads to a lot of issues, like a hazy or waxy film on the surface of the cured resin. 

The Effects of High Humidity on Epoxy Resin Projects

When working with epoxy resin in high humidity conditions, several issues may arise:

  • Extended Curing Time: High humidity can slow down the curing process of epoxy resin, resulting in a longer drying time. This can be frustrating for artists who are looking to complete their projects quickly.
  • Increased Bubbles: Excessive moisture in the air can lead to an increase in bubbles forming in the epoxy resin as it cures. These bubbles can affect the clarity and smooth finish of the final product.
  • Poor Adhesion: Extreme humidity can also affect the adhesion of the epoxy resin to various surfaces. In this condition, the resin may not bond properly, leading to weak adhesion and potential delamination.

The Effects of Low Humidity on Epoxy Resin Projects

This condition also poses problems for epoxy resin projects. In dry environments, the resin can cure too quickly, leading to a variety of issues, such as a brittle finish, cracks, or a hazy appearance. It is essential to strike a balance between adequate humidity levels to ensure optimal results.

  • Slow Curing: Epoxy resin cures by a chemical reaction that is accelerated by moisture in the air. When the humidity is low, this reaction can slow down significantly, leading to longer curing times.
  • Poor Adhesion: Low humidity can also affect the adhesion of epoxy resin to surfaces. The lack of moisture in the air can prevent the resin from bonding correctly, resulting in a weak and easily detachable finish.
  • Cracking: Inadequate humidity levels can cause the epoxy resin to dry too quickly, leading to cracks and other imperfections in your final product.

Tips for Working with Epoxy Resin in Different Humidity Levels

Now that you understand how this condition can affect your art projects, let's discuss some tips for working with resin in various humidity levels:

Understand How Humidity Affects Epoxy Resin

The trouble with this issue lies in the moisture content of the air. The material undergoes a chemical reaction to harden, and moisture can interfere with this process in many ways. For instance, epoxy resin cures through a reaction between the resin and hardener. Moisture can react with the hardener, specifically the amine component, disrupting the intended reaction. This can lead to an incomplete cure or a cloudy appearance in the finished product. Therefore, before beginning, you must have a basic understanding to avoid disasters. 

[Pro Tip: Use Proper Ventilation: Proper ventilation is crucial in preventing moisture buildup in the air, which can affect the curing process of epoxy resin. Make sure to work in a well-ventilated area or use a fan to circulate the air.]

Choose the Right Environment for Your Project

It would help if you worked in a space with a controlled climate to minimise the impact of humidity. If you are working in a fluctuating humidity environment, invest in a hygrometer to measure humidity levels in your workspace. This allows you to identify if adjustments are needed. By choosing the right environment and potentially using additional tools like dehumidifiers, you can significantly increase your chances of achieving a flawless project.

[Pro Tip: Contained Curing: In very humid environments, some epoxy brands offer specially formulated "wet room" epoxies that can tolerate higher humidity levels. However, always consult the specific product recommendations before using this approach.]

Use a Hygrometer to Monitor Humidity Levels

It is a tool that can help you monitor the humidity levels in your workspace. By keeping track of the humidity, you can make adjustments as needed to ensure optimal conditions for your epoxy resin project. Aim for humidity levels between 40-60% for the best results.

Adjust Your Mixing Ratio

In high humidity conditions, you may need to adjust the mixing ratio of your epoxy resin to account for the additional moisture in the air. Adding a bit more hardener can compensate for the moisture and ensure a proper cure. Be sure to follow the manufacturer's guidelines for mixing ratios to avoid any issues.

Allow for Longer Cure Times

If you are working in a high-humidity environment, you may need to allow for longer cure times. Be patient and avoid disturbing the resin while it is curing to prevent any imperfections in the finish. You can also cover your project with a dust cover to protect it from any debris while it cures.

How to Minimise the Effects of Humidity?

To minimise the effects of humidity on your projects, consider the following tips:

  • Preheat Materials: Preheating the resin and hardener before mixing helps reduce the impact of moisture on curing time. This can also help minimise the risk of adhesion issues.
  • Sealants and Primers: Applying these to the surface before applying the resin helps improve adhesion and prevent delamination. When using these, apply thin coats and allow them to dry completely before adding the epoxy resin. 
  • Polyaspartic Coatings: Consider using these coatings as an alternative to traditional epoxy resin. Polyaspartic coatings are moisture-resistant and cure quickly, making them less susceptible to the effects of humidity.


Humidity has a significant impact on epoxy resin projects, causing issues such as bubbles, cloudiness, or improper curing. The good news is that by understanding its influence and taking proactive measures, you can ensure your creations are clear, beautiful, and free from imperfections. Dive into the world of resin art with Arts Shala's engaging classes. Contact Us to know more right away.  

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