[cycleguy55]

This may not be generally suggested, but one solution you may wish to consider is the use of a 'cold weld' product. When I purchased my car I discovered a small leak in the lower tank - a slow ooze. Upon removing the paint and putty or caulk (best way to describe it) I discovered a brass patch that had been soldered on, then covered up. Not keen on pulling the radiator I buffed it down to the base material on the tank (brass) with a wire brush on a drill, made sure it was really clean, then used Permatex Cold Weld to build up a good patch. After giving it 24 hours or so to cure, I filled the system with coolant, fired it up and checked for leaks. I've put about 1,000 miles on it since then with no signs of leakage.