that's fuckin retarded... lol...

tell him to get an envelope and lick the crap outta the sticky part and rub it all over the edge of the overlapping paper before he rolls and give it a minute to dry up... when he's done rolling, he can lick that spot again to reactivate it... i'd still prefer to just close them as usual (?? lol i've never had a sealing problem, he just sucks at rolling) but that's bound to be better then using a glue stick..