Paper sealant... Modpodge?

I'm not quite sure where to pose this question. It's paper related, but not really modeling related. So, here goes....

I occasionally give presentations on 19th century paper currency. As a visual aid, I have printed out examples (paying strict attention to counterfeiting laws!), and mounted the print outs on both sides of pieces of artist mattboard to hand out to my audience so people can inspect examples. It's not unusual for me to carry these examples in my jacket breast pocket for up to eight hours a day--a rather warm and somewhat humid environment.

Does the PaperModeler collective have any suggestions on how I could seal these examples in order to protect them from fingerprints, smudging and peeling away from the mattboard due to being in my breast pocket? I also want to make sure they don't stick together. Would ModPodge work for this?

Thanks,

--jeff