How Long Does Epoxy Resin Take to Cure Under UV Light?

How Long Does Epoxy Resin Take to Cure Under UV Light?

Jan 19, 2024

Epoxy resin is widely used in various industries, including arts and crafts, automotive, electronics, and construction. It offers a strong and durable bond, making it suitable for a range of applications. By using UV light on epoxy resin, you can unlock various advantages such as faster curing times, enhanced quality, reduced waste, energy efficiency, and increased versatility. 

One common question that arises is how long epoxy resin takes to cure under this light. In this blog, we will explore the curing process and provide insights into the typical curing time. If you wish to know more about this topic, resin art workshops are an amazing means. 

The Curing Process of Epoxy Resin

Before delving into the specifics of curing time, it's important to understand how epoxy resin cures. It is a two-component system consisting of a resin and a hardener. When these two components are mixed, a chemical reaction is initiated, resulting in the curing process.

During the curing process, the resin undergoes a polymerisation reaction where the molecules link together to form a solid, crosslinked network. This transformation grants the material its exceptional strength and stability. It's worth noting that this process can be influenced by various factors, including temperature, humidity, and the type of curing agent used.

Curing Time of Epoxy Resin Under UV Light

Whether you're a professional artist or a DIY enthusiast, incorporating UV light into your epoxy resin projects can help you achieve impeccable results in less time. This light is commonly used to accelerate the drying procedure. When exposed to UV light, the epoxy resin undergoes photochemical reactions, leading to its rapid solidification. The intensity of the light, as well as the distance between the light source and the resin, can affect the curing time.

In general, epoxy resin can cure under UV light within a few minutes to several hours. However, it's crucial to consider that the exact curing time may vary based on several factors, such as the type and brand of resin, the thickness of the resin layer, and the specific UV light used.

To put it differently, the process of UV light curing entails utilising a UV lamp to solidify epoxy within a mere half a minute rapidly. Nevertheless, it must be acknowledged that not all resins are equal, and the intensity of UV lamps can vary significantly. It is crucial to bear in mind that UV light-curing devices come at a high cost. Therefore, it is advisable to consult the manufacturer regarding the viability of UV light curing for a particular product before proceeding.

Steps to Use UV Light on Epoxy Resin

  1. Prepare your epoxy resin artwork or project as per the manufacturer's instructions. Make sure the surface is clean and free of dust or debris.
  2. Choose a well-ventilated area. This will help to minimise the risk of inhaling any fumes emitted during the curing process.
  3. Set up a UV light source, such as a UV lamp or UV LED strip. Place it at an appropriate distance from the epoxy resin to ensure uniform exposure.
  4. Turn on the light and expose the epoxy resin to the UV light for the recommended duration. This duration may vary depending on the brand and type of resin you are using. Refer to the manufacturer's instructions for specific guidance.
  5. While exposing the resin, it is essential to rotate or move the project to ensure all areas receive equal exposure. This will help to prevent uneven curing and ensure a smooth and glossy finish.
  6. After the recommended curing time, turn off the UV light and inspect the project for any imperfections. If necessary, you can touch up or reapply a thin layer of epoxy resin to achieve a flawless result.
  7. Allow the resin to cure completely by keeping it in a dust-free environment for the recommended curing time.

The Benefits of Using UV Light on Epoxy Resin

  • Faster Curing Time: One of the main advantages of using UV light on epoxy resin is the significantly reduced curing time. Traditional curing methods can take several hours or even days, depending on the thickness of the resin. UV light curing, on the other hand, can cure the resin within minutes, saving you valuable time.
  • Increased Efficiency: UV light offers a more efficient curing process compared to other methods. Since the drying time is much shorter, you can complete projects faster, increasing your productivity. Additionally, UV light curing eliminates the need for heat, which can be damaging to certain materials and poses a safety risk.
  • Enhanced Clarity: UV light curing produces a crystal-clear, glossy finish on epoxy resin. This is particularly desirable for projects where transparency is key, such as encapsulating objects in resin or creating jewellery. The UV light ensures that the resin cures uniformly, resulting in a smooth and flawless surface.
  • Reduced VOCs: Volatile Organic Compounds (VOCs) are released during the curing process of traditional epoxy resin, which can be harmful to your health and the environment. UV light curing eliminates the need for heat, which significantly reduces VOC emissions, making it a more eco-friendly option.

Factors Affecting Curing Time of Epoxy Resin Under UV Light

To give you a better understanding of the factors that influence the curing time of epoxy resin under UV light, let's take a closer look at each one:

  • Type and Brand of Resin: Different kinds and brands of epoxy resin may have varying formulations, resulting in different curing times. It's essential to refer to the manufacturer's instructions for specific curing guidelines.
  • The Thickness of the Resin Layer: The consistency of the resin layer can significantly impact the curing time. Denser layers may require more time to cure completely, while thinner layers may cure faster.
  • Distance from the UV Light Source: The proximity of the resin to the UV light source plays a role in the curing process. A closer distance can result in faster curing, while a greater distance may prolong the curing time.
  • Intensity of the UV Light: The power of the UV light directly affects the curing time. Higher power can lead to faster curing, whereas lower intensities may prolong the process.

Tips for Efficient Curing of Epoxy Resin Under UV Light

To ensure efficient curing of epoxy resin under UV light, here are some helpful tips:

  • Follow Manufacturer's Instructions: Always refer to the resin manufacturer's guidelines for the recommended curing time and specific instructions for UV curing.
  • Optimise UV Exposure: Position the resin as close as possible to the UV light source while ensuring a safe distance to avoid overheating or damage. Experiment with different exposure times and intensities to achieve the desired curing results.
  • Consider Temperature and Humidity: Temperature and humidity can influence the curing time of epoxy resin. Aim to work under optimal conditions as specified by the resin manufacturer.
  • Use Suitable Curing Agents: Certain curing agents are specifically designed for UV curing. Consider using these agents to enhance the curing process and achieve faster curing times.


The curing time of epoxy resin under UV light varies depending on several factors, including the type and brand of resin, the thickness of the resin layer, the distance from the UV light source, and the intensity of the UV light itself. By following the manufacturer's instructions and considering these factors, you can ensure efficient and successful epoxy resin curing under UV light. 

Remember to experiment and adjust exposure times and intensities to achieve optimal results for your specific application. To understand the concepts of resin in depth and under expert guidance, visit Arts Shala’s website and don’t hesitate to Contact Us for more information. 

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