Does epoxy need air to cure? Epoxy dries faster with air?

Nick Shushan
By Nick Shusan , Epoxy Expert and the CEO of NYC Epoxy Flooring.

December 6, 2022

Epoxy is a thermosetting polymer that cures when it comes in contact with a catalyst. This means that epoxy does not need air to cure. The curing of epoxy is based on the chemical reaction of resin and hardener.

Does epoxy dry faster with air?

Yes, epoxy tends to cure faster when exposed to air because the air helps to facilitate the chemical reaction between the resin and hardener. This is why it is important to mix the two parts of the epoxy thoroughly and ensure that they are exposed to air while the epoxy is curing. The temperature and humidity of the air can also affect the curing time of epoxy, with warmer and more humid conditions typically speeding up the curing process.

Even though It is true that epoxy does dry faster when there is air present, this also depends on many factors such as temperature and humidity levels in the room. For example, if you have an epoxy glue that contains 100% solids and you are in a humid environment such as Florida, then the drying time will take longer than if you were in a dry environment such as Arizona or California.

The drying time of epoxy glue also depends on how thickly it was applied to the surface being glued together. If you apply a very thin layer of epoxy, then it will take only a few minutes to cure. For example, if you purchase an applicator bottle of epoxy that has a nozzle with tapered sides, it can be used to apply small amounts of epoxy on your workpiece in less than one minute.

Can you cure epoxy with a hair dryer?

Althought the short answer is Yes, It is not recommended to use a hair dryer to cure epoxy. While using a hair dryer may speed up the curing process, it is not a good idea for several reasons. First, the heat from a hair dryer may cause the epoxy to cure too quickly, which can result in a weaker and less durable final product. Second, the heat from a hair dryer may cause the epoxy to bubble or form cracks, which can also weaken the final product. Finally, using a hair dryer can be dangerous because epoxy produces fumes that can be harmful if inhaled. It is best to follow the instructions provided by the manufacturer of the epoxy and allow the epoxy to cure at room temperature.