If some caulks dry by exposure to air but are waterproof when dry, what keeps the caulk from forming a shell causing the inside of it to stay sticky?
In: Chemistry
The solvent keeping the caulk sticky isn’t water. It’s able to move throughout the caulk, and then evaporate from the surface. The outside sets a skin pretty quickly, to keep the caulk in position, and then the solvent slowly leaks out through the skin.
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