Ever throw a dress or skirt in the dryer right before the big event (when it really is supposed to be dry cleaned, but you were in a pinch), only to discover that the skirt shrunk and the lining hangs below the hem?  Well, I just did this before our office Christmas party, and boy was I glad I had this stuff.  I just rehemmed the lining with the iron and went out the door.  Obviously, also good to keep in your desk for a ripped hem.