Keeping the pictures from fading is a matter of: 1) Making sure the chemistry is right -- that the processing is fully neutralized, and that everything in contact with them is either pH-neutral or buffered appropriately. That includes the magnets and whatever you're using to seal the pictures. 2) Protecting them from ultraviolet light. 3) Protecting them from unreasonable amounts of heat. (Rule of thumb: If you're uncomfortably hot, other things probably are too.) There's a lot of info on the web about appropriate archival materials for photo storage; not much about archiving magnets. The best suggestion I can come up with would be to use those materials to encapsulate the photo, then affix that encapsulation to the magnet.
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Thnks. Maybe I wasn't clear enough. I print directly on the magnet. (Magnet "paper"). I was looking for something to "paint" over the printed side of the magnet to help preserve the photo. Again, thanks for your reply.
You can buy UV-resistant spray finishes at art stores, for protecting photographs and artwork. Perhaps one of those would work. Be sure to test it out first, or at least get some advice at the store.