Especially after using the same bottle of glue repeatedly
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How most consumer based glues work is they have a solvent that Carries the sticky material such as water or alcohol and this solvent has a tendency to slowly evaporate as it’s exposed to air, which leaves behind a dried up version of the sticky stuff, forming your bond. Well the air that accepts this evaporated solvent only has so much room for the solvent between the air particles, so for the glue to dry in a usable matter, it needs to be exposed to a large volume of air ie it needs to be squirted out of the bottle and now the glue can be in contact with all the air in the room your using it in (this is why many glues will recommend leaving outside in well ventilated area to dry, as the more air the glue can touch, the more solvent can evaporate at once).
in contrast the bottle only can hold a small amount of air, and therefore can only allow a small amount of solvent to evaporate (this is why sometimes you need to shake up a bottle of glue before reusing it as the surface level of glue might be a bit harder as it was exposed to air. Obviously as you use the glue, air will be pushed out of the bottle, and new air sucked in, which is why over a long period of time, glue in a bottle can harden and form a solid rubbery chunk, especially if the lid isn’t sealed properly (that’s why they tell u to close when storing it).
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