I dont think jb weld will stand up
Tensile Strength: 3960
Flex Strength: 7320
Tensile Lap Shear: 1040
Resistant to: 500° F
Mechanics -- you can use J-B WELD with confidence. It is designed for safe, reliable, permanent repairs in engine compartments and heated environments up to 500° F. It's strong as steel and impervious to water, gasoline, chemicals, and acids. Working with J-B WELD is quick, easy, and convenient -- and saves you time, work, and money!
I once picked up a exhaust repair putty to fill in some holes in my wifes old car that worked well it was called muffler mender by Victor products http://www.victorautomotive.net/pdfs/vic/ver1.pdf