Super Seal will repair most leaks. However, if the system cannot hold a charge for 24 hours, the leak is too large and probably needs manual repair. If the system is leaking slowly and holds a charge for more than two weeks, Super Seal should seal the leak. Super Seal will seal multiple holes in both the metal and rubber parts of the air conditioning system. Super Seal is an inexpensive alternative considering a repair that could be in $1000 range.