It is not unusual for someone with a big heel to step on the composition molded track of a sliding patio door system and break off a chunk. Compatible replacement tracks are virtually impossible to find.  But, alas, these tracks can be repaired in less than an hour and be twice as strong as the original. You will need just a few things… A length of “stainless track cover” cut to the length of the existing track, a 5-Minute epoxy syringe, a tube of steel-filled epoxy putty, several screws, a painter’s