IDK, but JB Weld done right is amazing stuff. I had a Toyota pickup that had a cylinder head with a couple of voids in it. When the voids let go, at about 275,000 miles, it mimicked a blown head gasket. I had taken the head to a machine shop for a tank, valve reseat, and a shave. Put it all together and it was shooting coolant out of a new void the tanking probably opened up in-between the exhaust ports for #1 and #2, just above the exhaust manifold. I cleaned it out as best I could, and packed it as full of JB Weld as I could with a popsicle stick. Found the original void causing all the problems after coolant was still burning out the tail pipe. It was at a coolant passage right at the #4 cylinder exhaust port, halfway to the valve. I did the same thing as the other void. That repair lasted until I sold the engine after the wreck, some 4 more years and with 325,000 miles on it.
Also, I broke off a bolt in an aluminum screw hole for the thermostat housing on my Toyota Supra. Drilling out the steel screw, I made a mess out of the surrounding aluminum. I packed that hole with JB Weld, then re-tapped it for a helicoil and used a M5 stud with lock-tight red. Holding strong 2-1/2 years later, no leaks.