Unfortunately, resin kits don’t always stay clear. Sometimes, you go to use your clear resin only to find it’s turning yellow. Ugh. What is happening?!
First, it’s completely normal for a two-part resin kit to yellow. In fact, all resin kits are going to yellow eventually. Unfortunately though, it’s hard to pinpoint exactly when that will happen. The hardener will yellow first. While the resin part may yellow, the hardener yellows quicker.
Resin kit components turn yellow for two reasons:
1. The kit is old. You should use epoxy resin kits produced within one year of manufacture. Only buy enough resin you can 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.
By the way, I’m over the top fussy about rotating our stock of epoxy resins. Know that if you buy resin from us, you will get the freshest, clearest quality resin anywhere.
So what should you do if your clear resin is turning yellow?
Great question! Here’s what I do with yellowing resin.
If you have stored your resin properly, it should cure as expected. Use it for your resin projects you are going to color anyway. Here are the results of using yellow resin in a casting project. If you decide you don’t want to use it, you must not really have a resin obsession. Okay, just kidding. (We’re a thrifty bunch.) Instead, dispose of your resin appropriately.
Moving forward, buy smaller clear resin kits that you can use within 30 to 60 days of opening. For example, don’t buy a gallon kit of resin that will take you six months or more to use. Instead, buy four sixteen-ounce kits of resin. Then, use a kit completely before opening a new kit.
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