How Long Does Epoxy Resin Last?

Posted on 23 Jul 09:21

If the bottles remain unopened, ArtResin has a shelf life of 12 months from the date of manufacture. Once the bottles have been opened, however, the shelf life is 6 months from the date of manufacture. You can find the manufacture date on the label to make it easy to track how fresh your ArtResin is!

What Does ArtResin's Shelf Life Refer To? 

ArtResin's shelf life refers to how long you can expect the product to stay as water-clear as the day it was made.⁣ ArtResin's shelf life is shortened once opened because of oxidation: when you open the bottle, the hardener comes into contact with oxygen and creates a yellowing effect, much like an apple that browns once it has been cut and exposed to air. ⁣Thankfully, this yellowing doesn't become apparent until approximately the 6 month mark.

TIP: To minimize oxygen exposure and delay oxidization, always ensure you re-cap the bottle as soon as you finish pouring your hardener. 

What's The Difference Between Oxidation and Yellowing From UV?

It's important to note that yellowing that results from oxidation is entirely different than the yellowing caused by UV exposure:

  • Oxidation is caused by oxygen exposure and causes the hardener to discolor. Once ArtResin cures, it becomes inert and the hardener will no longer react with oxygen or yellow further.

  • UV light damage causes yellowing in cured epoxy resin. ArtResin is chemically engineered with two different types of UV inhibitors to offer the best yellowing protection on the market. You can read more about it in our blog Which Epoxy Resin Is Best For Artwork?


Can I Use Expired ArtResin?

YES, you can.  If you find yourself with some expired product on your hands, please don't toss it in the trash! Though the hardener may have discolored, the performance of the product will not be affected and it will still cure as expected as long as it is accurately measured and thoroughly mixed.

💡TIP: Remember that the yellowing you see in the hardener bottle looks worse than it is because you’re seeing it in bulk. By the time you dilute yellowed hardener with clear resin and spread it out on your work, it won't look nearly as yellow.

How To Use Expired ArtResin:

Though you may not want to use yellowed hardener on a white piece of artwork, we've got 4 fun and easy ways to use up yellow hardener including:

  1. Coating colorful paintings
  2. Making alcohol ink coasters
  3. Tinting it to make flow art
  4. Applying it over wood

Once you're done, you won't see a trace of yellow in the cured resin, we promise!

For full instructions, check out our blog What Can You Do With Yellowed Hardener?