In my fantastic, seemingly never-ending wedding invitation assembly line, Sobo Glue is one of my most important tools. It holds down paper like a champ. Just a little squiggle, smooth it down and let it dry. It sets in a couple minutes and is completely dry in an hour. For good measure, I like to set my stack of drying invitations under a heavy book on an even surface for 24 hours to ensure that they dry flat and wave free. Sobo is inexpensive and readily available at most craft and art stores. I usually pick mine up at JoFabs with a handy 40% off coupon.