My notebook is in a ziplock bag, my small digital camera is in a small Pelican case, I’m soaking wet, but my directions to this place are waterproof.
MicroGlaze is effective for protecting most paper surfaces. Just rub a tiny dab on any paper surface and spread it very thinly over the area to be protected (a small make-up sponge seems to be the best applicator). The area is now water resistant and will resist dirt, stains, spills, and smears. MicroGlaze is unobtrusive and is hard to detect on a paper surface.
Of course I always rub a piece of paraffin wax over the address labels printed on the inkjet printer to prevent them from running if they get wet. I have gotten so used to doing this I now do it on all outgoing mail by habit.