I have a small leak at the top of my air conditioning condenser.
Last summer, I tried patching it with JB Weld. They do advertise as working with all metals, but I suspect it failed to hold because it doesn't bond well to aluminum. I could get enough refrigerant in to get some cold air, and then the patch would blow. By the third patch, it seems the hole was getting bigger because it blew very easily. (So, I guess it must have had enough hold to pull some more metal out — d'oh.)
How would I go about patching with a torch? My closest experience is with brazing on brass. Just getting a little aluminum plug welded over the tiny hole shouldn't be too bad.
What kind of torch, flux, and rod would I use? Is there anything in particular to know about condenser tubing?