yea, ive never tried it but supposedly its the same as that blue goop they smear over the beads when you get tires mounted, i know it sounds really weird. ive also heard of people doing that when they get their slicks mounted without tubes or screws, it supposedly will keep them from spinning or losing air or something.
im sure hairspray would work too, when i used to make potato guns it SUCKED if you got hairspray in the threads of the pvc pipe.. if you let it sit overnight the next day it would be a pain in the ass to unscrew the caps.