Graded slabs and UV issues?

[jchcollins]

Does anyone have any legit horror stories of PSA or SGC graded cards getting really damaged by light / UV rays?

I've long been intrigued by the fact that some of the supply companies like Ultra Pro and Pro-Mold market mag cases and other products in some instances with UV protection. But the top graders, PSA, SGC, and Beckett have never to my knowledge even addressed the issue of UV coatings. My guess as to why would be because any type of UV film or coating that is added to a hard plastic - and you usually seem to get at least some type of light residue. For example the UP One Touch mag cases look super clear most of the time. But if you hold them at an angle in the light, you can usually see some smear of something - which I am guessing is the result of the UV block application, or however they do it.

I guess my overall question here, is this actually a big deal? I know that UV-C rays cannot penetrate most plastics, but that UV-A and B can. One SGC slab with no advertised UV protection recently just sold for north of 12 million dollars. Is this something to be concerned about at all if I'm not just leaving super valuable slabs in my windowsills facing west every afternoon?

As somewhat of a card supplies OCD candidate, my mind wanders in such directions sometimes. I recently just ordered a product called "UVBLOC" PSA graded card sleeves - in the hopes that if it cannot do any actual good, it can maybe still calm my paranoia some when I inadvertently leave a nice Mantle slab on my desk with a lamp on in the corner of the room some days. Discussion? Thanks.