This is the plan:
1) drink the Sprite
2) cut the can open
3) cut a patch of thin Aluminum
4) sand the patch & the inside of the radiator tank
5) clean both surfaces thoroughly with degreaser & brake cleaner
6) dry both thoroughly
7) quickly apply E6000 to the patch, insert it, press it into place, reinstall the plug, and pressurize the radiator to force the wet adhesive into the leak, carrying the patch with it. JBWeld or JBKwik would also work, and I've used them successfully on another radiator repair.

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Owner caption September 2012 · Photo 4716 of 5000