Why is my Epoxy Resin Not Curing?

Did you measure the pouring solution properly before pouring the hardener and epoxy?

Did you mix the solution fully using proper tools?

Did you use clean and dry utensils while pouring the mixture and mixing?

Did you create the solution in a area that is up-to the room temperature between 24-30 degrees C?

Did you use the same brand of resin and hardener?

Even after drying, is there any wet or sticky spot not hardened properly?

Some people think that adding more hardener will make the cure harder, or cause it to cure faster.

Once you've ensured your mixing ratio is accurate and equal, it's important to mix both parts together thoroughly.

Water and Resin are not friends. Even the tiniest drop of water or other contaminant can cause a host of problems, including cloudiness, bubbles and an improper cure.

Cure time is affected by temperature. Warmer temps accelerate cure time and colder temperatures slow down cure time. The ideal room temperature for mixing epoxy resin is between 75 and 85 degrees F or 24 - 30 degrees C. If it’s colder than that, the resin will be thicker and harder to mix, will have more bubbles and will take longer to cure until it’s dry to the touch.

Every paired resin and hardener within a brand's kit work together as a system and cannot be reliably interchanged. So, make sure that both are of the same brand.

Scrape off the wet material as best you can and discard. Be sure all the liquidy resin is removed. If after scraping, you're left with a deep divot or crater, patch in some new thoroughly mixed resin just in that spot. After drying, lightly sand the entire piece and and wait till the layer below has been cured and dried properly before adding another layer.

The issue might be due to expired raisin or hardener or a low quality product or the epoxy has not been given enough time to set and harden.