How does epoxy resin work?

Epoxy is a material that has various applications. You can think of epoxy as having two components, resin, and hardener. These are mixed together to form a thick, sticky paste that eventually cures into a durable plastic material.

How does epoxy resin harden?

So how does epoxy cure, exactly? It’s all about a chemical reaction. Epoxy resin is unique in that it starts off as a liquid and then, after being mixed with the hardener, becomes solid.

This is due to a combination of the resin and hardener reacting with one another in what’s known as an exothermic process—which means it gives off heat as it solidifies. The end result is a hardened epoxy you can use for your project! You’ll need to give it plenty of time (usually 24 hours or more) to cure before using it.

How does epoxy resin harden?

  • Epoxy resin is a liquid material that hardens when mixed with a hardener.
  • The resin and the hardener are mixed in a specific ratio to start the chemical reaction that causes the epoxy to harden. This is called curing.
  • Epoxy resin will not react and begin to cure until mixed with the proper type of hardener for that particular brand of epoxy. The harder does this by allowing oxygen atoms from its molecules to bond with the resin, creating new bonds within the mixture itself.

How long will epoxy resin last?

Epoxy resin is a very durable material. It is used in the construction of buildings, bridges, and highways, as well as in home improvement projects. Epoxy resins can last for decades and are an excellent choice for anyone who wants to protect their investment.

Epoxy resins are made from a two-part epoxy system that includes an epoxy resin, which is combined with a hardener or catalyst.

The two parts are mixed together to create a curing reaction that produces cross-linked polymer chains. This process produces a solid material with excellent chemical resistance, high tensile strength, and low shrinkage properties.

How long does epoxy resin last on a surface?

This depends entirely on the environment in which the epoxy resin is applied. If it is exposed to high temperatures, UV light, and heavy chemicals, such as in a commercial setting, it may last only a few years.

In more benign environments, like a garage or basement floor in a residential setting, an epoxy coating can last much longer–up to 20 years or more.

Epoxy resin is extremely versatile, so there really are no limits on how it can be used.

What are the disadvantages of using epoxy resin?

  • Epoxy is expensive.
  • It’s toxic. You need to use masks and gloves when handling it, and you must work in a well-ventilated area.
  • You can’t use epoxy outside. It’s sensitive to temperature so it will get gummy if the temperature falls below 60 degrees Fahrenheit (15°C). (That means no patio table makeover or countertop refinishing.)
  • It takes a long time to cure. In fact, most products advertise “24-hour cure time” which sounds fast until you realize that 24 hours after you’ve finished applying your resin the surface is still not dry and it may take up to two days for the material to be really hard. This means more waiting around before you can start using your project than if you used a different material like concrete or polyurethane, both of which are cured within a few hours after application.(That means no quick weekend projects.) Additionally, if your project has layers of resin on top of one another, each layer needs 24 hours to cure on its own before the next layer can be applied on top of it. So let’s say your tabletop has three layers of resin totaling 1/8″ thick – that’s only a total thickness of 3/8″ but each layer will take 24 hours to cure meaning that the finish won’t be completed for 3 days – again making this a bad choice for anyone who wants quick results or instant gratification!

How do you know when epoxy is fully cured?

Epoxy resin cures through a chemical reaction between the resin and hardener. The process of cross-linking results in a three-dimensional network of polymer chains, which is the reason why it is so strong and durable.

The curing process of epoxy can take several hours or days, depending on factors such as heat, humidity, and other elements. It’s important to know when your project is fully cured so that you can use it as intended!

What happens if you pour epoxy too thick?

If you pour too thick of a layer, bubbles form on the surface. This happens because epoxies begin to cure from the bottom-up (think about how jelly sets in a mold) and as the epoxy heats up, it starts off-gassing. These tiny gas bubbles collect on the surface and are not easy to get rid of.

Also, if you pour too thick of a layer at one time, your piece will most likely become brittle. If you pour more than 1/8″ at a time (or use more than 2 ounces), then you run the risk of having it not cure properly.

Keep in mind that if your piece has multiple layers of resin (which is often used for river tables or jewelry), then each layer must be very thin, no thicker than 1/8″-1/4″ thick otherwise they may not cure completely.

So how thick should an epoxy resin piece be? Epoxy art pieces should stay under 1″ in thickness for optimal results!

Does epoxy melt in sun?

Epoxy will not melt in the sun. In fact, cured epoxy can withstand high temperatures and is even used as a heat resistant coating for industrial applications. It’s true that cured epoxy is more brittle in extreme heat, but it won’t fully soften or liquefy unless it’s exposed to temperatures in excess of 300° F (149° C).

However, uncured epoxy is more prone to melting under direct sunlight. If this happens, you’ll have less time to work with your resin before it sets. To avoid this problem when working outdoors on a sunny day, set up your work area in the shade.


I hope you found this introduction to epoxy resin helpful.

Epoxies are a truly versatile product that can be used for many different applications. They have a lot of useful properties that make them ideal for many situations.

Epoxy resins aren’t hard to use, once you know what you are doing. If you are properly prepared, applying and curing your resin should be fairly straightforward so I recommend trying it out if there is something you want to make or mend with epoxy resin.

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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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