Does UV light cure epoxy?

Epoxy resin is a strong, yet breakable adhesive substance that can be used in many different settings. You’ve likely seen it on commercial products as well as in art projects.

UV light is also commonly known as natural sunlight. This type of light creates a chemical reaction that can cure epoxy resin quickly and efficiently.

UV light is an extremely important factor to consider when working with epoxy resin because it affects the quality of your project, how long it takes to complete, and how much money you spend on supplies.

This guide will help you understand the relationship between UV light and epoxy resin so that your project can be completed successfully.

Does UV light cure epoxy?

You’ve heard that UV light can cure epoxy, but you’re not sure if it’s true. Is this glowing-in-the-dark business real? Does it work?

The short answer: yes, but only with the proper additives.

UV light hardens epoxy by initiating a photochemical reaction. It comes in varying wavelengths and is measured in nanometers (nm).

“Long” wavelengths like 365 nm and 385 nm are generally easier on the eyes and able to pass through plastic or glass without being filtered out.

These long wavelengths are also better for casting clear glazes because they will penetrate deeper into a resin surface than shorter ones.

Longer wavelengths emit less heat when exposed to air so they don’t warp metals as much either; however, they require more photons per square area per second (PPS) to accomplish their curing action than shorter wavelengths do—so be prepared for some patience!

UV light is not the same as blacklight. Blacklight bulbs emit a lot of visible blue light along with some UV rays at around 400nm which means that they’ll help you see things glow in dark rooms without having any impact on how well an epoxy cures over time or under different conditions.

Can I cure epoxy resin with UV light?

Yes, you can cure epoxy resin with UV light, though there are a few restrictions to how and when you use it.

UV light is an effective way to cure epoxy resin because it reacts with the photoinitiator in the resin. When the photoinitiator is exposed to UV light, it creates free radicals.

Free radicals react very quickly in polymerization reactions, which makes them a useful way to move reactions faster.

The amount of free radicals created by UV light is more than those created by visible or other forms of light, so UV light allows for faster reaction rates.

The restriction on curing your resin with UV light is that the resin needs to be clear for this technique to be successful. In order for the UV light to reach the photoinitiator in your curing resin and create free radicals, it has to pass through your clear coating or casting first.

If your epoxy product is not clear or has a tinted color added, that means that some of the UV light will be absorbed or reflected by these particles instead of reaching the photoinitiator where it has the highest potential for use.

UV cured resins do not give off any heat as they cure so even if you’re working in a hot workspace environment already (like near hot lights), there’s no need to worry about adding additional heat into the mix (no pun intended).

What does UV light do to epoxy?

To answer that, we first need to know what sort of electromagnetic radiation (EMR) is.

EMR is a form of energy that consists of both electric and magnetic fields in the form of a wave or particle. This can be anything from X-rays, radio waves, and microwaves to visible light and infrared.

The resin itself absorbs the EMR which then initiates a photochemical reaction inside the liquid. This causes the product to harden on its own, without heat being applied – hence why it’s called an “exothermic” reaction.

The bond between molecules (the crosslink) will increase over time if they’re kept in a UV environment for too long which reduces the flexibility of the material; this also leads to yellowing as it ages called “photo-oxidation” where oxygen molecules impinge upon polymers present within polyester resins forming peroxides through exposure or proximity.

with high-energy photons emitted by ultraviolet lamp sources when left unshielded from ambient light sources such as daylight hours during daytime periodicals within 24 hour periods due to their ability for significant penetration distance into materials considered translucent under these circumstances; thus turning yellow because sunlight consists mainly of short-wavelength photons which are more energetic than longer wavelength ones (like red).

How long does epoxy take to cure under UV light?

It depends on the type of resin you are using. For example, if you use a UV-curing epoxy resin, it may take as little as 5 minutes to cure under UV light.

But if you are using a non-UV curing epoxy then it will never cure fully under UV light. You can speed up the curing process by increasing the heat (UV light causes heat to build up).

It is highly recommended that you keep your area well ventilated and have some fans or airflow around your product so that it does not overheat.

What Are The Effects Of Heat On Epoxy Resin?

The effect of heat on epoxy resin is very significant when it comes to curing time and physical properties such as strength in general.

If there’s one thing that every person should know about epoxies, it’s that they don’t like being exposed to high temperatures for too long because they will lose their structural integrity and not cure properly due to thermal breakdowns occurring within them (this may be different depending on which brand of resin you use though).

If this happens then whatever project has been created from this “broken down” material could potentially fail catastrophically when put into service – so please make sure everything stays nice and cool while working with epoxies!

Can I use a blacklight to cure UV resin?

While it seems like a good idea to use a blacklight to cure UV resin, this is not the case. Blacklights do not produce enough UV light to cure UV resin.

You need a 365nm wavelength UV light source in order to cure the resin. It is definitely possible that you could use other sources of artificial light, but I haven’t tested any.

In summary: if you want to use blacklight as a curing mechanism for your UV resin, it won’t work.

Does UV light cure resin faster?

UV light, or ultraviolet light, is different from ambient light in that it’s a wavelength, not temperature. UV light is invisible to the human eye and has shorter wavelengths than our natural visible spectrum. Because of this, UV light can cure epoxy much faster than ambient light.

In fact, if you cure your resin under UV lights for just a few seconds, you will have cured it enough to handle the object with your hands. Just make sure you wear gloves!

This is great if you need to use your resin project immediately but be careful! Depending on the quality of your UV lamp, you run the risk of yellowing your resin pieces over time when they’re exposed to sunlight or even fluorescent lights.

However, some resins are specially formulated to withstand sunlight without yellowing (like our Gloss & Matte Finish Resins).

If this is something that’s important to you and your finished projects check out [link] for more information on how exactly we do this with our resins!

Will epoxy resin harden without hardener?

When you mix resin and hardener together, the chemical reaction that occurs causes the resin to transform into an entirely different material.

This is why it’s so important to use gloves with epoxy resin—it will literally stick to your skin! The hardener acts as a catalyst, which is literally defined as “a substance that increases the rate of a chemical reaction without undergoing any permanent chemical change itself.”

Think of it like putting wood on the fire. The wood catches fire because of the heat of the match or lighter. Without this heat (or catalyst), you cannot create fire.

You can put all the wood in the world together and it will not burst into flames. The same goes for epoxy resin and hardener—without one, nothing will happen!

Does UV light work as a catalyst for epoxy resin?

The short answer is no! While UV light does generate some heat (which may seem like it could help catalyze an epoxy mixture), ultraviolet light does not act as a catalyst for curing your epoxy resin project.

Ultraviolet light might be able to create some small changes in your cured piece over time, but if you want your epoxy resin project to cure quickly and properly, don’t try using UV light instead!

Why is my UV resin sticky after curing?

|Does UV light cure epoxy?|Yes, UV light can cure epoxy. However, in order for the process to work, your resin needs to contain photoinitiators.

Photoinitiators are molecules that undergo a chemical reaction when exposed to specific wavelengths of ultraviolet light.

These molecules break apart and start a chain reaction that eventually forms a hard plastic from the epoxy resin. A UV lamp or curing station is used to provide the appropriate wavelength of ultraviolet light so that the photoinitiators break apart and begin the curing process.

Curing times for UV-cured resins typically range from 5 seconds up to several minutes, though some specialty high-performance products can take up to ten minutes or more to fully cure.

After curing with UV light, resin may feel slightly sticky on the surface. This is because there are still residual monomers in the cured part – these monomers react with moisture in the air or on your skin when you touch them, which causes them to feel sticky.

If your part feels sticky after curing it with UV light, you should be able to easily fix it by leaving it out overnight and then sanding away any leftover monomers on its surface (as long as they’re only on the surface).


Now that you know all there is to know about UV lights and epoxy curing, let’s sum up the points we’ve covered:

  • The use of a UV light in conjunction with a resin can save you time and energy.
  • You shouldn’t rely on it 100 percent of the time, especially if you want to ensure your resin cures completely.
  • There are many different types of resins out there and some are better for UV light curing than others—read the instructions carefully to determine what will work best for you!
  • If you do decide that this route is right for your project needs (and hey, who could blame ya?)—make sure not to get too close to those rays yourself because even though they might speed up cure times on some materials, they won’t have as positive an effect on human skin!
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Martin Flood

Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.

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