Epoxy resin has become a must-have material. Online and in magazines, you’ll find countless projects made with epoxy. This may have inspired you to give it a try yourself. But before diving headfirst into your first project, there are a few basics you need to understand to use epoxy resin correctly. Here is a beginner’s guide to help you get started with confidence.
1) Follow the manufacturer’s instructions exactly
Epoxy resin is made up of two components: a resin (base) and a hardener. When mixed together, they trigger a chemical reaction that causes the resin to cure. This is why it is absolutely essential to follow the manufacturer’s recommended ratios to achieve a flawless result.
This may seem obvious, but it’s crucial because the correct mixing ratio can vary from one manufacturer to another.
Respect the recommended ratio
To achieve a successful mix, you must also consider the density of the components. If the resin and the hardener do not have the same density, they will not weigh the same.
In a basic 1:1 system (equal parts), both components must have the same weight for the mixture to cure properly.
For this reason, it is strongly recommended to measure both components precisely before mixing. We advise using a graduated measuring cup to measure the exact volume of each liquid. Measuring by volume allows you to be precise without having to calculate density. By using equal volumes of resin and hardener, you should achieve the expected result.
2) Pay attention to environmental conditions
Following the manufacturer’s instructions is one thing, but you must also consider environmental conditions when working with epoxy resin. What do we mean by environmental conditions? Room temperature and humidity, for example.
These factors are important because epoxy resin is sensitive to both. Ambient temperature plays a key role during mixing and curing.
Low temperatures
If the temperature is below 20°C (68°F), the resin will take longer to cure. Low temperatures can also cause the formation of a waxy surface layer known as amine blush. This film is very difficult to remove.
Cold conditions may also cause the resin to crystallize. Additionally, the lower the temperature, the thicker (more viscous) the resin becomes, making it harder to mix properly.
High temperatures
What happens when the temperature exceeds 20°C (68°F)? The resin reacts much faster. Around 25°C (77°F) is the ideal temperature for mixing epoxy resin. At this temperature, curing is not too fast, giving you enough working time.
Above 25°C, the chemical reaction accelerates significantly, leaving you with very little time to work before the resin begins to harden.
If you are working outdoors, don’t forget to account for temperature variations between day and night.
Humidity
Humidity in the air is another critical factor. If humidity levels are too high, the resin may react poorly and the quality of your mixture will suffer.
If you need to work on a damp surface, make sure it is properly dried beforehand.
If you are not using the components immediately, keep the containers tightly sealed. This prevents damage caused by humidity and oxygen, both of which can degrade the products.
Also remember to consider your substrate: its temperature and moisture level are just as important.
3) Mix the components thoroughly
Once conditions are optimal, it’s time to mix. To achieve a good result, both components must be mixed thoroughly. Keep in mind that epoxy resin is sticky, and a significant amount will cling to the walls of the container.
You should therefore prepare a sufficient quantity to maintain the correct ratio between the resin and the hardener.
Tools
Choosing the right tools is also essential. We recommend using a container or bucket with sufficient capacity, ideally with a pouring spout for larger projects.
Avoid metal containers, as the mixture generates heat and metal can cause overheating—or even burns.
For mixing, use a wooden spatula or wooden or plastic stir sticks. These tools allow you to scrape the sides and bottom of the container properly, ensuring a homogeneous mixture.
4) Use the right epoxy resin
Always choose a high-quality product over a cheap epoxy resin. You won’t regret the investment. Low-cost resins often lead to poor results, and you may end up having to buy resin again.
Don’t play amateur chemist
Never mix different resin systems together. The resin and hardener you purchased as a set are designed to work together. Mixing one component with a different resin or hardener can lead to unpredictable and potentially dangerous results.
Likewise, it is essential to use colorants and pigments that are compatible with epoxy resin.
5) Do not dilute your epoxy resin
As mentioned earlier, moisture is extremely harmful to epoxy resin while it is still liquid. Make sure your tools, containers, and stir sticks are completely dry before mixing.
Also ensure there is no dust or residue in your container before pouring the resin.
That’s it—you now know the main factors to watch for when working with epoxy resin to achieve the best possible results. Visit our website to discover more guides and tutorials to help you successfully complete your epoxy resin projects.
