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.
Most silicone calks are moisture cure. There is moisture in the air. You can also mist it with water to speed up the curing. Read the ~~tune~~ tube.
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