Why are they patching it? why not replacment? they charge an arm and a leg anyways, one rads not going to shut them down plus there rep is on the line with a patch. should still work but still i bought a griffen because it was half the price as a becool.
If it's an adhesive designed for the right temperature range and aluminum it will probably outlast the radiator. Some of the autobody adhesives in use today for aluminum, steel, and composites are amazing and I wouldn't hesitate to use these even considering a radiator rarely would exceed 240 degrees.