Some call this the best repositionable glue for card workers.

Delivered in a handy pen this water-based no wrinkle, acid-free, card safe glue goes on blue but dries clear.

Use it in its blue state for a permanent bond but use it once clear for a temporary stick, much like rubber cement but with easier separation and a lighter touch.

Two Small areas of this glue will hold a pair of cards together for handling (even card tossing) but a gentle push will allow them to be separated without any obvious effort.