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Workhorse or show? Different approach maybe. I have body-filled parts of radiators where damage has occurred. Works great and is permanent if done properly. Down side is loss of the area as a radiator where the body filler is spread. Have successfully fixed radiators damaged by being hit with a rotating fan. Solder as you are trying. Down side is if the tubes are soldered in production you may open up more than you close! Especially without a solder iron and with a bare flame around the other tubes. With one damaged tube. Cut it, open it and inject sealant into both open ends as far as it can be got. Crimp/bend over the ends so the filler is trapped and forget it. Remove the top and bottom tanks and solder shut that one or more faulty tubes. Easier to do if air can escape from hole in tube. One end is easy, the other can keep blowing through unless the hole (leak) is large enough to prevent the hot air in the tube expanding. This is my usual approach if the radiator is like that as there is no further visual damage to the radiator and if the leak is on an inner row, there is no alternative. Take it to the experts. It is only a small job and the consequences of getting it wrong can be expensive. Regards, RAB
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