So you bought a brand new glue stick, and after your first craft using it, a forgetful child leaves the cap off. When you finally get around to cleaning up the craft several days later, it is a shriveled peg of dried glue. Oh well, throw it out, right? Wrong! You can rehydrate dried-out glue sticks! Just fill with water, stick the cap on, and leave it overnight. Tomorrow morning, you will have a brand new glue stick again!