Why doesn't glue stick to the bottle?

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You’ve probably noticed that glue sticks to pretty much everything it touches! So then shouldn’t it stick to its own bottle? What a sticky problem!

Have you ever learned about how glue holds things together? In order to harden and stick, most of the kinds of glues you’re probably used to using have to allow the water in them to dry out (evaporate). To do that, the glue needs to be exposed to air; if it’s not exposed to air, the glue usually won’t dry. So, by keeping glue in a sealed up bottle, there isn’t enough air reaching the glue for the water to dry out and the glue to stick! (On the outside of the bottle, it’s a different story… streaks or droplets of glue will almost always harden and stick.)

by   (whyzz writer)
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