Best Radiator Stop Leaks

[Al Smith]

You can solder an old copper radiator but it takes some practice if you've never done it .Pressure wash all the crude off it .Uses a soft wire brush around the leak and acid flux with 50/50 solder .An acetylene turbo torch works good but a propane bernz o matic type work will work if that's all you have .Just watch you don't get it so hot you pop a seam .Old truck and tractor radiators you'll be doing it quite often .Damned things are old as the hills .40 years of hard water does a number on that copper .
Fact when I changed the radiators on both Georgia's Envoy and my Jeep CJ 5 vintage 1960's I used distilled water with the anti freeze .At 89 cents a gallon it's worth not having an acid condition to get started .

 

[460 magnum]

The raw egg trick works pretty good, but does have its limits. I had a buddie when we was 16 had a dodge Dakota with a leaky radiator he would put probably a dozen eggs in ever other week, but he also drove the dog snot out of that thing. His theory was it has a rev-limiter for a reason and he used it.

 

[Al Smith]

The egg deal might work on an old tractor with a low pressure cap and 6-8 gallons of coolant .How well it would work on a high pressure system might not be so good .

 

[timg]

K Seal works very well and is antifreeze compatible. No clogging the heater cores. Dark blue bottle with orange/white lettering.