How does the liquid glue in the bottle not stick together
It is closed, correct? Whenever glue gets into contact with air, it dries. The glue inside the bottle is not experiencing any air.
Ummmmm... My mind is BLOWN!
The inside of the glue bottle is probably coated with something
no air in the bottle.
It requires AIR to dry it. Which is why, if you leave the bottle open it will dry right up. But if you close the bottle the tiny bit of air inside is kept moist enough by the mouiture content of the glue to not dry up.
The glue does stick together, did you ever notice how gooey the glue is as it comes out? That's the glue sticking to itself.