This stuff is a life saver for me.  I wear down the heels on my shoes very quickly.  I can build the heels back up with shoe goo.  (I use blue painter's tape to hold the glue in place while it cures.)  I let them cure for 2 or 3 days and then my built up heels are ready for action.  For me, it lasts about as long as the rubber heels that come on the shoe.