Unfortunately, resin kits don’t always stay clear. If you are asking yourself, why is my clear resin turning yellow, here’s what is happening:
In a resin kit, the hardener is most likely to yellow first. While the resin part will eventually yellow, the hardener yellows more quickly.
Resin kit components will turn yellow for two reasons:
1. The kit is old. You should use epoxy resin kits produced within one year of manufacture. I recommend only buying enough resin that you can comfortably use within six months, knowing that you can go a little longer if necessary. Like whoever throws out unused resin?
2. The kit is oxidizing. Open bottles allow the exposure of the liquid to oxygen in the air, causing them to turn yellow. After opening a resin kit, you should use it up as quickly as possible, preferably within thirty days.
Pro tip: It has been my experience that the ‘big box’ crafting supply stores don’t always do the best job of rotating resin kit stocks. I’ve heard from several customers how their excitement in working with resin turned to disappointment when their resin kit looked something like a doctor’s office urine sample when they got it home. To say I am over the top fussy about rotating stock on the resins sold at Resin Obsession is an understatement. Know that if you buy resin from us, you can be assured of the freshest, clearest quality resin anywhere.
So what should you do with yellowing resin?
Great question! Here’s what I do with yellowing resin.
If it has been properly stored, your clear resin that is turning yellow is still likely to cure. Use it for your resin projects that you are going to color anyway. Here are the results of using yellow resin in a casting project.
Moving forward, buy smaller resin kit sizes that you can use within 30 to 60 days of opening. For example, instead of buying a gallon kit of resin that will take you six months or more to use, buy four sixteen-ounce kits of resin. Then, use a kit completely before opening a new kit.
Have more beginner questions about resin? Grab a copy of Resin Fundamentals. It’s the PDF book that will take you from confused to confident with resin in an afternoon!
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