Sticky for envelopes?

[pandaxgirl.livejournal.com]

tomorrow i am going to spend the whole entire day making paper, for my homemade stationery I plan to sell [don`t worry, i`ll post pictures when I`m all done :D ]

I was wondering, if I were going make some envelopes for these as well, what should I use to make them stick? You know how on envelopes, you wet the closure part & it sticks? Something like that.

Any suggestions?

Thanks so much!