Well, I can comment on water damage. My printer ink is totally immune, and so is the Platinum carbon black. I don’t trust the black in felt tips, but the printer ink would be fine. Probably. My printer ink has a curious property of being perfectly water soluble until absorbed by certain materials including paper and fabric, after which it becomes pretty darned permanent.
UV damage, well, if my ink dyes are the same as in the UV faded inkjet printouts I see taped to the windows of abandoned storefronts, then that will be a problem if I decided to put the pages of my notebook on display in direct sunlight. I’ve never done that or have been compelled to do it, but never say never, I guess.
That’s a good question, though. Have you lost data to sunbeams before, or is this more of a hypothetical?