A tin filled with a hardening substance is used in Recruitment Drive during the Miss Cheevers challenge. It is one of the 9 stages of tins used during the quest. The lumpy, hardening tin is created by using a vial of liquid on the gypsum filled tin. It should then be used on the chained key to create the tin (impression). This begins the plaster cast for the bronze key needed to complete the challenge. Using the wrong ingredients can result in a useless tin (strange).