Why Is My Epoxy Resin Still Sticky? Epoxy resin when used properly will give you fantastic results. Even though epoxy resin is fairly easy to use when you take some precautions and follow the instructions, it’s not immune to a lack of attention.
There are many reasons you can find tacky stops or the epoxy remains sticky. If you find yourself in those situations, it is important to understand what happened. In this blog you will find the most common reason why your epoxy resin will not cure completely and remain sticky. Firstly, epoxy resin is a two-component system with a Resin and hardener. Once mixed the curing process with start based on the reactivity and pot life. Once the chemical reaction begins, the epoxy will go from a liquid form, catalyze and become inversely solid. If the chemical reaction is disturbed or compromised the epoxy will note cure properly and never reached full hardness. This disruption will leave the epoxy sticky or remains soft.
Why is my epoxy resin still sticky?
1. Mixing ratio is off
When measuring your Resin and Hardener, it is important that the ratio by volume or weight is spot on precise. If you add more Resin or Hardner the ratio will be off and the stochiometry will be as well. Make sure you follow the instructions and ratio. Most of our products are 2:1 ratio. The only system with a 1:1 ratio is our CHILL 3D – Countertop & Art epoxy. Make sure the mixing cups are precise and clean. Some hardware store cups can may have been printed incorrectly and the ratio will not be accurate. We offer the possibility of buying graduated containers with our logo. These are accurate.
2. Mixing to quickly ( Not enough)
If the mixing ratio was on point, the other reason why the epoxy could remain sticky or not cure properly is the mixing process. In order to cure properly the molecules of Part A Resin and B Hardener need to be perfectly homogenious. If the mix is missing molecules on both sides, the epoxy won’t catalize or will leave uncured epoxy. We recommend to mix small quantities for 3-4 mins with medium speed.
For bigger projects, ( Pale size or rive tables) er recommend to mix for at least 8-10 mins. In both cases, it is very important to scrapes the sides and bottom of your mixing container. Some resin and hardener is most likely going to stick to your plastic container. This amount of molecules need to be incorporated in the mix for the epoxy to fully cure. If the sides and bottom aren’t scrape, unmix epoxy will fall into your project.
3. The last drops
Even thought you think your epoxy is 100% homogenious, never let the last drops fall into your epoxy. As a precaution, throw away the remaining epoxy after pouring. If you forget to scrape the sides and bottom, 99% of your epoxy might be mixed well enough. By not incorporating the remaining epoxy sticking to the container, there will more chance of not having sticky spots.
4. Dirty or contaminated tools
Contamination, Water, Humidity need to be avoided at all cost when using epoxy resin. Even just a small amount of water is enough to affect the epoxy and make it cloudy. Ensure you mixing tools such as metal spatula, mixing cups are clean.
In conclusion, make sure to follow those steps to avoid soft, tacky and sticky epoxy.
4. Using the wrong hardener
From time to time, we have users mistaken and using the wrong hardener. By doing so, the stochiometry and molecule arrangement will be modify. If this happens, the epoxy will note cure properly.