I have used it on an oil pan also, worked great;
just make sure the area is very clean. My son
used it to repair a cracked block in an old 390
in a Ford pickup. Was not leaking & still running
good when he sold it.
I used it to fix a leak(well, more like the grand canyon, thing corroded from the inside out) in a water pump on a GTO I used to have as a daily driver. Never had a leak after that, still holding when I sold the car a couple of years later.