Hassman,

Yep -- under pressure, the JB-Weld will indeed fail. It is also not waterproof. I compensated with metal epoxy putty, but when my next radiator failure occurs, it will be time to replace it.

Interestingly, even the ones with metal sleeves fail at the neck. Every broken radiator my mechanic has has the metal insert in the neck. It does not seem to work.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black