What makes glue harden with exposure to air?
In: 2
Glues like Wood glue and White glue work by evaporation. The are water based and as the water evaporates the glue hardens and creates a strong bond. They stay liquid in the bottle because the water can’t easily escape.
Glues like Cyanoacrylates (super glue) and polyurethane (Gorilla glue, PL Premium) work by chemically reaction. When they are exposed to water like the moisture in the air then undergo a chemical reaction that cures them. They stay liquid in the container because water can’t get to them.
This is why blowing on superglue helps it cure, it’s not the air it’s the moisture in your breath that does it
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