The phrase "crust formation" refers to the process of a hard layer or coating developing on the surface of something, usually as it dries or cools down.
Sentences with «crust formation»
Currently, there are two primary theories for crust formation. (astrobio.net)
It started out clear and then yellow with crust formation in the corner. (wagwalking.com)
Cover the surface with plastic wrap (in order to avoid crust formation). (lilcookie.com)