JB weld saved my S twice:
1. Aluminum oil pan on International motor (DT466). Temperature goes up and down, obviously expending and contracting. Vibrating when engine is running. Crack was about 5-7 inches long. "V" grooved, drilled holes on the ends of crack. Cleaned oil and stuff with carburetor cleaner. Still holding after 2 years.
2. Radiator leak on my plow truck during this 2,000 mile storm. Radiator pan on IHC-2674 L10 Cummins. Hole rusted about size of $0.25. Sanded around hole about 1/2 inch. Cut stainless steel hose clamp to make a "structure". Put JB Weld on edges, stick my"structure" to it. Put more JB Weld on top. After 1 hour truck was back on route. Because of JB Weld I did not lose 50 hours plowing shift. 2 Moths still holding.
Other words I truly believe in JB Weld, It is grate material. Make sure to get a lots of CLEAN surface to bind. Make sure it's cured before disturbing.