Oh, by the way...my original radiator was fine without leaks following a repair of an 8" crack. My first repair was a single coat of JB Weld, but the repair failed. I removed the old JB and resanded the entire area aournd the crack. Over the course of three days, I JB'ed three layers...each overlapping the other (after thorough sanding each time). I allowed a full day of dry time between layering. I did, however, expect future problems, so I bought and installed new aluminum radiator.