Question

why doesn't glue stick to its bottle

Answer 1

BECAUSE GLUE DOESN'T HARDEN UNTIL IT COMES IN CONTACT WITH AIR. IT WORKS BY FILLING IN THE CRACKS AND HARDENING THERE.

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Answer 2

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As the water evaporates, the glue dries and hardens. All that's left are the sticky polymers that hold things together. ... When white glue is inside a bottle, there's not enough air inside the bottle to cause the water to evaporate to make the glue sticky.