Recently bought a tube of super glue to fix something, and I started wondering how it stays a liquid inside of the tube/bottle and doesn’t just stick to the sides?
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Super glue is activated by exposure to oxygen. If the glue is kept in an airtight container with no oxygen, it will generally remain fluid. This is why after opening, the super glue tends to form a block at the tip of the dispenser because oxygen gets in. Since most (cheap) containers are not completely air tight, after awhile an opened super glue dispenser will also become solid.
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