Weddingbee boards

I used 3M spray on adhesive for our invitations.  When you spray it appropriately in an even layer you get wonderful adhesion.  The glue is flexible and not brittle, so you don't get any cracking or peeling the way you would with a roll-on adhesive.

However, my favorite adhesive in the world (though not for invites) is E-6000!

I got ours at the store where we bought our paper.  It's basically designed for invitations, so you'll usually find it there... but you can also find it at craft stores and at sewing stores.

http://solutions.3m.com/wps/portal/3M/en_US/3M-Super-77/Super77/

If you use the spray, make sure you are using it in a well ventilated area. Also, do some test runs. I used it for my WE DO letters and I had to spray more on because it didn't stick. I wasn't liberal enough with it. You will also need to put something underneath where you are spraying it, so you don't get it on stuff you don't want to get it on.

Glue dots are my favorite. They stick to everything. I use the DOTNGO brand. They are clear and you can get them in a dispenser. If you are using vellum, there is something similar that is specifically made for the vellum. I haven't used it yet, but I am thinking it may be thinner.