Glue was a substance which holds pieces of damaged objects solidly in place by bonding the broken edges together.
The shopkeeper Garos applied glue with a paint brush to the damaged statue of an Akaali creature to fix the broken wing when Jonathan Archer and Trip Tucker entered his curio shop. (ENT: "Civilization")
In 2153, Sim accidentally broke off a nacelle from a model spaceship built by Jonathan Archer while flying it in Enterprise NX-01's launch bay two. Archer assured Sim that the damage was "nothing a little glue can't remedy." (ENT: "Similitude")