Does epoxy cure in cold weather?

Do you want to know if epoxy cures in cold weather? Just because the temperature drops, it doesn’t mean that your work has to come to a halt.

The answer is yes! Epoxy can cure in cold temperatures, but there are precautions you need to keep in mind.

This article will explain two things: what precautions you should take and how the curing process differs from warm weather conditions.

Does epoxy cure in cold weather?

Can epoxy cure in cold weather? Yes, it can. Epoxy cures more slowly at lower temperatures and is less reactive than at warmer temperatures. The lower the temperature, the longer it takes for epoxy to cure.

Epoxy reacts by combining resin and hardener to create a chemically cured plastic that is stronger, harder, and tougher than the sum of its parts.

The chemical reaction (cure) of epoxy occurs at a slower rate when temperature is low.

How cold is too cold for epoxy resin?

No, epoxy does not cure in cold weather.

Epoxy cures best at temperatures between 65 and 90 degrees Fahrenheit. If the temperature of the resin is too hot or too cold, the epoxy will not cure properly.

For example, if you are working in a cold garage and it’s 40 degrees Fahrenheit outside, your resin won’t cure.

Likewise, if you apply an epoxy coating to your driveway on a 100-degree day when the sun is beating down directly on your work surface, it will cure faster than normal and get so hot that it will bubble up and turn white before drying clear (as it should).

(We’ll talk about remedies for this problem in a bit.)

How long does epoxy resin take to cure in cold weather?

The short answer is that there is no simple answer. It depends on the product, and it depends on the temperature.

Epoxy resin products are highly versatile, being very strong and durable, as well as easy to use. They have many uses in construction, repairs, and crafts.

Does temperature affect epoxy curing?

When you choose to handle epoxy resin, there are a few basic things you should know about its curing process. The first is that the temperature of your environment has a significant impact on how long it takes for your resin to cure.

The second is that if you want to get the best results from your epoxy, then you need to make sure that it cures at the optimal temperature.

This will change depending on what product you’re using and what type of work you’re doing with it. In general, however, most resins cure fastest between 70-85 degrees Fahrenheit with an optimal temperature of 75 degrees Fahrenheit (see our chart below).

What happens if resin is too cold?

If epoxy is too cold, it won’t cure properly. Instead of a beautiful hard resin, you’ll likely end up with a cloudy and soft cured piece that will just be sticky and stringy.

Additionally, cold temperatures will make the resin more viscous, meaning it won’t flow as well. The result may appear lumpy or chunky if bubbles aren’t able to rise to the top before the resin begins to set.

Will epoxy resin harden without hardener?

Nope! You need the hardener for it to cure. If you mix resin and hardener together but don’t use it right away, it will be ready later.

But if you mix the resin with something other than the hardener, or leave just that “something else” alone on its own, it won’t cure.

The resin alone is only resin until you add a catalyst like our Hardener. Then there is a chemical reaction that causes the curing process to begin.

Can I use a hairdryer to dry epoxy?

  • Do not use a hairdryer to dry epoxy. This is a big no-no. Hairdryers will cause bubbles, and also cause the resin to kick off too soon, crack, and harden with a tacky surface.

Will epoxy melt in the sun?

This is actually a great question. The short answer is no, epoxy resin won’t melt in the sun. In fact, the heat from the sun can actually be beneficial to your epoxy project because it will speed up the curing process.

This can be particularly helpful if you’re working on a larger piece and need to deal with exotherm (the heat that’s generated as epoxy cures).

However, there are limits to how hot your epoxy can get before it starts curing too quickly for you to work with it effectively.


If you’re still skeptical about using epoxy in cold weather, then you should at least be aware of the following:

  • Epoxy can cure in colder temperatures. Curing time will be longer but it is possible.
  • Temperature does affect curing times; warmer temperatures will reduce the amount of time needed for full cure of epoxy resins.
  • The sun can be used to help heat epoxies to help them cure faster. Avoid direct sunlight, however, because it will cause excessive heat buildup from UV rays and can actually make your hardener evaporate or bubble (the bubbles are simply air trapped by the sun).
  • A hairdryer on a low setting works well too if you don’t want to wait for a sunny day.

Finally, keep in mind that even though many people have had success with their DIY home improvement projects during winter months — there are some situations where taking extra precautions might not hurt either! When applying resins over porous surfaces like wood or concrete use an outdoor grade primer first before applying your resin coatings so they adhere properly without cracking as they dry out during colder seasons when water is present all around us (and inside our walls!). This way if something does go wrong during application–like cracking due to temperature changes–at least you won’t need any major repairs later on down the road!

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