How to seal a bookmark

Joanne just raised an excellent question about the upcoming bookmark swap.
What kind of glue/sealant should be used to ensure the bookmark doesn't have a residual stickiness that will ruin your books when you try to use it?

rule #1
NO MOD-PODGE

Sorry mod-podge lovers.  Even though I use it for some things, I don't trust it for something that's going to spend most of it's life pressed between paper.

Also -  no hair spray.
I know a lot of people use it, and it might be fine for a postcard, but it's too sticky (and smelly) for a bookmark.

Review our glue discussions for recommendations on people's favorite glue sticks and other adhesives.
A few additional thoughts off the top of my head:
  • you could laminate them
  • I've had good luck with spray sealants.  I use Krylon crystal clear - it comes in a can like spray paint.  The downside is  you can't use it indoors because it's toxic and smelly, but it does a nice job sealing things and keeping them from smudging. (here's a nice tutorial on using fixatives from Quinn Creative)
  • Make your bookmark out of fabric, or stitched paper, or paint/draw directly on your bookmark so there is no glue involved at all

 As always, your suggestions are quite welcome.  I will revise and update this to showcase your brilliance!

Reader suggestions: 
  • cover in clear packing tape
  • sew the bookmark to a plastic sleeve/transparency