I had just finished installing a Derale dual fan with separate electronic thermostats. This after rewiring the entire engine with new wiring and routing from "The New System" out of California. The stock wiring ran from alternator to battery over the radiator and the last thing I did after running the 'New System' was pull the now redundant charging circuit from the old layout. (time to start laughing) As I carefully pulled the wire across the front of the radiator I had that 'OH NO!' feeling that I had forgotten to do something as I realized that I had not disconnected the battery and then POP!, HISS! Coolant pissing out of a new hole I had just melted in the radiator. My question is this: I repaired this hole and a previous one using very clean surfaces and careful application of solder. This was over a year and thousands of miles ago and both patches have held. Am I lucky or have I inadvertently just done a pinhole repair the way they would in a radiator repair shop?
OEM brass and copper radiator I assume? A "radiator shop" would do a really thorough cleaning job first but other than that a soldering job is a soldering job.... My grandfather used to fix his Model T radiator on a monthly basis