How to prevent discoloration or parts in storage?
Product description says:


  UV protection helps reduce fading on flooring, furniture, portraits, blinds and draperies


Reduce, not eliminate, because such film cannot remove 100% of UV, and regular light can also participate in fading a bit.

If you want to store them, not to display them, then box will do. One that isn't transparent. There are opinions that airtight boxes help, too, but I haven't tested that. Regular dark box did a pretty ok (not perfect) job for me when I stored my bricks for many years.