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Originally Posted by Elmer.G.Lue
Dear Pookie,
Why doesn't glue stick to the inside of the bottle?
Sincerely,
Elmer.G.Lue
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Because if it did, it wouldn't come out.
Seriously though, some glues work by “drying” out (in fact the solvent evaporates, concentrating the chemicals). Some work by reacting chemically with the air (oxidation) to change the chemicals into adhesives.
When glue is inside the bottle the solvent can’t evaporate, nor can the air get to the chemicals, so until they come out, they won’t stick!