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This reminds me of Flexplay, which was a DVD that had a coating which made the disk unreadable after 48 hours. Technology Connections did a wonderful video about it.
Could you just hit them with clearcoat right out of the gate?
These disks were designed to self-destruct in the presence of oxygen. They literally rust away.
Oxygen and its O2 form does like to sneak into everything. Even sealed in the original packaging, there's a limited shelf life. Flexplay claimed stability of only one year, which isn't much given it comes sealed in a plastic bag.