The second most popular question I get asked is ‘Why didn’t my resin harden? You just mix the stuff together and it gets hard, right?’ Yes, technically speaking. But sometimes it doesn’t work out that way. Here are the twelve most common reasons I see why your resin didn’t cure.
(And read to the end of the article if you’re wondering what the number one question is that I get asked most.)
1. How old is your resin?
Only buy enough resin that you can comfortably use within half of the expected shelf life. Moisture can collect in your bottles, which will affect how it cures. Besides, all resins eventually yellow so you want to use your resin while it’s still clear.
2. Are you keeping your resin in a climate-controlled environment?
If the temperature changes a lot, moisture will collect on the inside of the lids. This water drips into your resin and affects curing.
⭐️ BONUS: Here’s how to store resin.
3. Did you measure it properly?
Measuring it properly means using graduated mixing cups to make sure you get accurate measurements. They’ve got lines on the side so you can see exactly how much you’re measuring. Unlike party cups and bottle caps.
4. Did you mix it thoroughly?
You need to mix the resin well, scraping the sides of your cup and resin stirring stick as you go.
⭐️ BONUS: Here’s how to mix resin and hardener in five easy steps.
5. Were your mixing cups dry?
If you reused them, was there any leftover residue? Any extra water, soap, or solvents can explain why your resin didn’t cure.
⭐️ BONUS: Here’s how to clean resin tools for another use.
6. Are your inclusions completely dry?
Inclusions are anything extra you add to epoxy to make your resin crafts. If you sealed items with glue, are you sure they were dry before adding to your resin?
BONUS: Here’s how I like to seal items before including them in resin.
7. What was your room temperature?
Resin cures best in a room temperature of low 70’s F. Make sure to mix your resin at the right temperature.
8. Did you mix it in the proper ratios?
Always read the directions! Every resin has its own mixing directions. Do not assume they all mix the same. Otherwise, you may find yourself asking…why didn’t my resin harden?
9. Were both parts of the resin kit from the same manufacturer?
You cannot use one brand’s resin with another brand’s hardener. It doesn’t work like that.
10. Did you mix the minimum amount?
When you mix resin and hardener together, a chemical reaction causes heat production. This heat is what makes the mixture get hard. You have to mix together a specific amount of each to generate enough heat for the resin to harden.
11. Are you using a latex mold?
Sometimes, resins do not like latex. Weird, right?
12. Was your mold dry before pouring?
Your resin mold release must be completely dry before pouring resin into that mold.
⭐️ BONUS: Here’s how I apply release to a resin mold
So what’s the number one question I get asked (after why my resin didn’t cure)?
Why do I have so many bubbles?!
I can help with that too.
BONUS: 10 tips for getting bubbles out of resin
Frustrated with your resin results?
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