Ah yes, the aluminum soldering at home scenario ...
Well I tried that first, used the aluminum solder/map gas method and did the right prep etc without much success.
The "welding" jobs looked totally pro after finishing and would be fine for something other than a gas-tight seal but after two attempts and two refits/regassings I found it was impossible to eliminate new pinholes forming during heating.
I think it might have been a different result if the condenser had been holed by a rock or something; my condenser was corroded from the inside - the whole area of the leak was very thin and couldn't take the prolonged high temperature reqd for the "solder" to flow.
So I said to hell with it and came up with the La-co repair followed up with a big epoxy reinforcing sleeve. Worked like a charm, 2 yrs on and 3 degrees Celsius on a run last week with outside temps high 20's
94 XJ40 VDP
Oyster Metallic/Doeskin on Aero Alloys
220,000 Kilometers/136,700 MilesDaily Driver
94 XJ40 SOVEREIGN
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 MilesParts Car