Hey everyone, it’s Jake here, founder of that small resin fridge magnet brand you’ve probably seen popping up in a few craft markets and Etsy shops lately. I get all kinds of DMs and comments from people asking random questions about these little guys, and one I’ve been getting a ton lately is: “Do resin fridge magnets get messed up by humidity? I live somewhere super muggy, so I’m scared they’ll get ruined in my kitchen.” Resin Fridge Magnet
Fair question, honestly. I used to worry about this too when I first started making these in my garage back in 2019. My first batch had a few that got left out on a windowsill during a summer monsoon (oops, forgot to bring them in) and one turned a little foggy. That’s when I started digging into why that happened, testing all kinds of conditions, and working with a chemist buddy of mine to figure out how to make them hold up better. So today, I’m breaking this down real casual, no textbook jargon, just straight-up what I’ve learned from making and selling thousands of these things over the last 5 years.
First off, let’s get one thing straight: resin itself isn’t a total moisture magnet, but not all resin is created equal. The stuff I use now is a two-part epoxy resin, right? Not that cheap thin stuff you get at the dollar store that’s basically just plastic with some pigment. Dollar store resin’s often formulated for basic crafts, not constant exposure to the kind of humidity you get in a kitchen or a bathroom that’s right next to the fridge (trust me, I’ve seen people put magnets by the fridge steam vent, which is basically a humidity bomb). That thin resin actually absorbs tiny amounts of water over time, which is what causes that fogginess or even slight discoloration if it’s sitting in super damp air.
Wait, let’s make that clear: it’s not that humidity “attacks” the resin. It’s moisture from the air getting trapped in tiny, microscopic gaps in the resin’s surface or structure. Like, imagine a sponge that’s so tiny you can’t see the holes. Humidity is water vapor, so when the air is really wet, those tiny gaps fill up with water, and that makes the resin look cloudy. I tested this a bunch: I left two batches of the same design out in my bathroom for 3 months. One was made with that cheap craft resin, and it was all foggy when I checked. The other was my regular epoxy resin, and it looked exactly the same as when I put it there.
But here’s the thing: even the good resin isn’t totally immune to extreme, constant humidity. Like, if you live somewhere that’s 90% humidity 24/7, like parts of Florida or Southeast Asia, yeah, you might see very minor fading after a few years. But that’s not a “ruined” level. It’s just a tiny change, not something that makes the magnet stop working or fall apart. I’ve had customers in Miami and Singapore message me a few years after they bought magnets and say they still look great, just a little less bright than when they got them, which I also kind of love—gives them that little bit of character over time.
Another big factor here is the finish we put on top. I learned this the hard way too. Early on, I just poured the resin and called it done. Then a customer in Houston sent a photo of their magnet after a summer rainstorm—water had beaded on top, seeped under the resin edge, and made the whole thing lift a tiny bit off the fridge. That’s when I started adding a top coat of UV-resistant sealant. Not just any sealant, though. I use a polycrylic one that’s made for outdoor use, because it’s flexible enough to move with the resin when the temperature changes (which also affects humidity, by the way—hot air holds more moisture, so when the AC kicks on and it cools down, the moisture in the air turns to condensation, which is another thing that can get trapped if there’s no seal).
Wait, let’s talk condensation specifically because that’s a way bigger issue than just regular humidity. If you live somewhere with super hot, humid days that turn cool at night, or you have your fridge in a spot where it’s right next to a window that gets morning dew, that condensation is like little water droplets sitting directly on your magnet. If the seal is good, it just beads off and doesn’t get in. If the seal is bad, those droplets will seep in, and you get that fogginess I mentioned earlier. I tested this by putting a magnet on my fridge right above the water dispenser for 6 months—super steamy every time someone gets a glass of water. Still looks perfect, no fog, no lifting. That’s the power of a good top coat.
Also, what the magnet is embedded in or under matters a lot. I make a lot of custom magnets—some with dried flowers, some with glitter, some with little tiny resin figurines. The dried ones? If you use fresh flowers instead of properly pressed, dried ones, they can hold moisture inside, which will then escape over time and get trapped in the resin, making it foggy. I stopped using fresh blooms a long time ago for that exact reason. Glitter is fine, but I make sure it’s sealed tight so it doesn’t leach any oils into the resin that could make it cloudy. And the tiny figurines—they’re all resin too, so I make sure they’re fully cured before embedding them, because uncured resin can have leftover chemicals that react with moisture.
Now, let’s get to the real world stuff, because I know you guys care about actual use cases. If your kitchen is like mine—average humidity, not a sauna, not a desert—these magnets are basically indestructible when it comes to humidity. I’ve had some on my own fridge for 4 years, and they look the same as day one. If you live in a super humid place, or you like to leave your magnets on the back porch (wait, don’t do that, actually—they’re fridge magnets, meant for fridges), they’ll still last a long time, just maybe a tiny bit of fading after 2 or 3 years, which is normal for any decorative item.
Wait, I also want to bust a myth here: some people say resin magnets will get rusty. No, not if the magnet itself is sealed. I use neodymium magnets, but I always glue them into the back of the resin with a strong epoxy, then add another layer of resin over the back to seal it completely. So that magnet is totally encased, no exposure to air or moisture, so no rust. I had a customer in Seattle, which is like the rainiest place in the US, buy a set for their new apartment, and they told me a year later the magnets worked just as well as when they got them. That’s the sealed back doing its job.
Another test I did a while back: I took a few magnets and left them in a humidity chamber that’s set to 95% humidity, which is way higher than almost any kitchen ever gets, for 30 days straight. I checked them every week. The only one that had any issue was the one made with that cheap craft resin, and it was a little foggy around the edges. The ones made with my regular epoxy and top coat? No changes at all, even under a magnifying glass. That’s when I knew I was onto something.
Now, why does this matter to you, especially if you’re looking to buy resin fridge magnets in bulk, or even for your own use? Because not all makers are as careful as I am. A lot of people just mix resin, pour it, add a magnet, and that’s it—no top coat, no sealed back, cheap resin. So if you buy a $5 set of magnets from a random Etsy seller that’s super cheap, there’s a good chance they’ll get ruined by humidity way faster. But if you buy quality resin, a good seal, and take basic care of them, they’ll last you for years.
Wait, care tips! Let’s throw those in real quick, since that’s probably what you’re here for. If you have a resin fridge magnet, don’t scrub it with super harsh chemicals when you clean your fridge. Just wipe it with a damp cloth and a little mild soap, done. Don’t leave it out in the sun for weeks on end—UV rays can fade the pigment, but that’s not humidity related, just good general care. And if you notice a tiny bit of condensation on the back edge (that’s rare, but if it happens), just wipe it off with a dry cloth, no big deal.
As a supplier, this is the stuff I care about more than anything. I don’t sell junk that falls apart. Every batch I make goes through a quick humidity test before it ships—nothing crazy, just leaving a few out on my workshop counter for a week to make sure no fogginess pops up. I also include a little care card with every order that talks about how to keep your magnets looking good, because I want my customers to be happy with their purchase for years, not just a month.
I know a lot of people are worried about this because they’ve had bad experiences with cheap resin items. I get it—my first batch was terrible. That’s why I’m so open about this stuff. I don’t want anyone to buy a magnet from me thinking it’ll last forever in a super humid bathroom, because it might, but I’d rather set realistic expectations than have someone come back upset. But at the same time, I want everyone to know that high-quality resin fridge magnets are totally fine for regular kitchen use, even in pretty humid areas.
So to wrap this up, let’s answer the original question clearly: Are resin fridge magnets affected by humidity? Short answer: Only if they’re made with cheap resin and no proper sealing. If they’re made with good two-part epoxy, have a UV-resistant top coat, and a sealed back with the magnet, they’re basically resistant to normal kitchen humidity, and even most of the really humid places out there. The only time you’ll see a change is if you have extremely high humidity 24/7 for years, or they get left in direct condensation for weeks on end, and even then it’s minor, not something that makes them stop working or look terrible.
If you’re looking for durable resin fridge magnets, whether for personal use or for your business, hit me up to chat. I can send over samples, tell you more about how I make them to hold up to humidity, and work with you on whatever size or design you need. I’ve worked with cafes, boutique shops, and even a few wedding planners doing custom magnets, so I know how to tailor orders to fit different needs, no matter where you’re located.
Resin Keychains References:
- Lambourne, R., & Strivens, T. A. (1999). Paint and Surface Coatings: Theory and Practice. Woodhead Publishing.
- Polymer Science Learning Center. (2018). Water Absorption in Polymers. University of Southern Mississippi.
- ASTM International. (2020). Standard Test Method for Water Absorption of Plastics. ASTM D570-20.
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