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Gouache is very versatile and can be used with a variety of mediums, but there are also some other pluses and some negatives to using gouache. You can rewet gouache after it dries because it doesn't go through a chemical change when it is dry. Gouache provides excellent coverage when applying. However, if you apply gouache too thickly it has been known to crack or peel. Because gouache dries lighter than it does when it appears wet, it can make color matching difficult.