Can a UV Flashlight Make Epoxy Resin Cure Faster?

Can a UV Flashlight Make Epoxy Resin Cure Faster?

Feb 21, 2024

Due to its versatility and strength, epoxy resin has become a popular choice for crafting, woodworking, and other DIY projects. However, its curing process can be time-consuming. This has led many crafters and hobbyists to wonder if there is a way to speed up the curing time. 

One method that has gained attention is the use of a UV flashlight. In this blog, we will find out whether you can use a UV flashlight to make epoxy resin cure faster and explore its effectiveness. We recommend enrolling in a reputable resin art course to learn more about this topic. 

Can a UV Flashlight Expedite the Curing Process?

The short answer is yes. A UV flashlight can indeed make epoxy resin cure faster. UV light initiates and catalyzes the curing reaction in many types of epoxy resins. When exposed to this light, specific wavelengths within the spectrum trigger a chemical reaction that causes the resin to solidify and harden quickly. This can significantly reduce the overall curing time for such art projects.

How Does a UV Flashlight Work with Epoxy Resin?

A UV flashlight, or a UV lamp or torch, works with epoxy resin by emitting ultraviolet light that activates the curing process. The light emitted by a UV flashlight falls within the ultraviolet A (UVA) range, typically between 315 to 400 nanometers. Unlike regular flashlights that utilize visible light, a UV flashlight emits light in the invisible UV spectrum. This specific wavelength is crucial for curing epoxy resin as it triggers the photoinitiators present in the resin.

When the UV light from the flashlight comes into contact with the epoxy resin, a chemical reaction called polymerization occurs. This reaction causes the liquid resin to harden and solidify, transforming it into a durable material. The photoinitiators within the resin act as catalysts when exposed to UV light, triggering the polymerization process.

Factors to Consider When Choosing a UV Flashlight for Epoxy Resin

When it comes to selecting a UV flashlight for epoxy resin, there are a few factors to consider:

1. UV Wavelength

It is crucial to consider when choosing a flashlight for epoxy resin. Different resins have varying requirements in terms of UV wavelength for optimal curing. Most epoxy resins require a wavelength between 365 and 405nm for proper curing. Check the resin manufacturer's instructions to determine the optimal wavelength required.

2. Power Output

This determines the intensity of the UV light emitted. Higher power output results in faster curing time. However, it is important to strike a balance as excessive power can cause overheating, leading to unwanted side effects such as discoloration or yellowing of the resin. Generally, a UV flashlight with a power output ranging from 3W to 10W is sufficient for most epoxy resin projects.

3. Battery Life and Rechargeability

Consider the battery life and rechargeability of the UV flashlight. Long battery life is essential, especially for larger projects that require extended curing times. Opting for a rechargeable flashlight ensures convenience and cost-effectiveness in the long run. Look for flashlights with lithium-ion batteries for longer-lasting power.

4. Durability and Build Quality

Epoxy resin projects often require precision and attention to detail. Choosing a UV flashlight with good build quality and durability is crucial. Look for flashlights made of sturdy materials that can withstand wear and tear. Additionally, ensure the flashlight has a reliable on/off switch and a comfortable grip for ease of use during extended periods.

5. Size and Portability

Consider this point, especially if you work on resin projects in different locations. A compact and lightweight flashlight is convenient to carry around and easy to handle during resin application. Portability allows for greater flexibility in your creative endeavors.

Tips for Using a UV Flashlight with Epoxy Resin

To achieve optimal results when using a UV flashlight to expedite the curing process of epoxy resin, consider the following tips:

  • Ensure Proper Exposure: For the UV light to effectively catalyze the curing process, it's essential to provide adequate exposure to all areas of the resin. Move the flashlight across the surface methodically, covering every inch.
  • Monitor the Curing Process: Keep a close eye on the resin as it cures under UV light. While the process may be faster than usual, it's crucial not to rush or overexpose the resin to prevent potential issues.
  • Use Protective Eyewear: UV light can harm your eyes, so always wear appropriate eyewear when working with a UV flashlight.
  • Test and Experiment: Before working on a large project, conducting small-scale tests and experiments with different epoxy resin brands and UV flashlights is always helpful. This will help you understand the curing characteristics of each brand and fine-tune your process accordingly.
  • Keep Distance in Mind: The distance between the UV flashlight and the epoxy resin can affect curing. Maintaining consistency in the distance will ensure uniform curing. Refer to the manufacturer's guidelines for the recommended curing distance.
  • Quality Assurance: To ensure the quality of your epoxy resin projects, always purchase resin and UV flashlights from trusted suppliers and manufacturers. This will guarantee that you are working with reliable and tested materials.

Considerations for Different Epoxy Resin Brands

Different epoxy resin brands may have specific requirements or recommendations for using a UV flashlight to accelerate the curing process. It is crucial to consult the manufacturer's instructions and guidelines for the resin you are using. They may have valuable insights on the optimal UV exposure time, the intensity of the UV light, or any other important factors to consider.


Incorporating a UV flashlight into your epoxy resin projects can effectively speed up the curing process. By utilizing UV light, you can achieve quicker results without compromising the strength and quality of the final cured resin. Remember to select a suitable UV flashlight, provide proper exposure, and follow any guidelines provided by the epoxy resin manufacturer. 

Considering these considerations, you can enjoy faster curing times and complete your projects more efficiently. To learn more about resin art, visit Arts Shala's website or Contact Us for further questions.
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