eli5, While I would like a general answer, the concept that brought this question up was drywall compound, specifically “hot mud”. “five minute hot mud” sets in five minutes but takes longer to dry. What is the difference?
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Real dry wall compound will create a very strong material when you mix it with water. It creates a chemical reaction with the water and forms a new compound from the water similar to the way cement and water make concrete. It doesn’t dry, if it simply dried then they’d be water soluble and mixing them with water would make it dissolve. Set just means it’s firm enough to work with, but the chemical reaction hasn’t finished yet and it’s not at it’s full strength.
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