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Okay, here's the answer back from a guy that's done it many times for custom cards:
What worked best was SUPER 77 Spray Glue. Back when I was at Art
school I had much of that in supply around. I believe they still make
it.
But be careful of over srpay. You basically have to build a mask of
the area you want to glue... and spread paper out 2 feet in each
direction to protect your floor. I actually did my spraying outside.
But I'm not brave enough to try that :/