I’m wondering if the chalkiness isn’t some body chemistry issue, because that happens ONLY to my BIL’s magic bands. We will come home from a trip and his is chalky and starting to degrade, and everyone else’s is fine. He’s only been on a couple trips, but it’s happened every time.
I have a long chain of MBs on a coat rack, I have them dating back to when they were first introduced. All of mine are fine, none of the plastic has degraded. The very old ones, from when they were thicker, are kinda stiff.
I also have a couple special edition and custom bands, they’ve held up well, BUT the printing on them sometimes gets tacky after they get wet, so I avoid wearing them in pools and such.