What makes glue harden with exposure to air?
In: 2
Depends on the glue. But most glues use a solvent (water, alcohol, or something else) to suspend an adhesive. When exposed to air, the solvent evapourates leaving the hardened adhesive behind.
Cyanoacrylates like Super/Krazy Glue react with water. The humidity in the air causes cyanoacrylate to chemically change and seal the mating surfaces together.
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