Very smooth surfaces such as glass are poor candidates for regular CA glues ... thermoplastic adhesives that cure by cooling. Most glue sticks are composed of the copolymer ethylene-vinyl acetate ...

This glue is not as liquidy as regular glue but still works with positive and negative ... They are the right size, number, and stickiness to make the note stick well enough but not too well.

When is a hot glue stick not a hot glue stick? When it’s PLA, of course! A glue gun that dispenses molten PLA instead of hot glue turned out to be a handy tool for joining 3D-printed objects ...