FH and I bought a photomat to have our guests sign instead of a traditional guestbook. FH wants to use gel pens - I'm worried they'll smudge. He says the Sharpie pens won't smudge, and I looked it up online and it says they're "smear resistant." I'm fine using them - I'd prefer to use them - but I'm fearful they'll smudge because people will just be signing the mat one after another and won't wait for the ink to fully dry. Does anyone have experience with this sort of thing?