How To Weld Aluminium Radiator. Though it had plastic end tanks leak was on the end tank and it was a beater car that I didnt care about. That being said I have repaired a radiator with JB Weld in the past.
You can try JB weld super alloy 1 aluminum radiator repair epoxy soldering aluminum radiator material and many others. Apply the rod continuing to broadly heat the punctured radiator. Pinhole sized leaks in the radiator can be temporarily repaired with a radiator sealant product such as Alum-A-Seal or Bars Leak.
Before I laid the final weld sealing the two halves of the end tank together I took some high temp waterproof epoxy and sealed the edges around where the plate sat near the coils.
Using The J-B Weld. Auto Repair Tips. You can try JB weld super alloy 1 aluminum radiator repair epoxy soldering aluminum radiator material and many others. Do the job in a well-ventilated area as the fumes can be nasty Once the nylon rod has been melted into the repair area take out the rest from the welder.