I can a test to that. At my old job we fixed a cracked block on a M5 with it, just to get the car mobile so the customer could use his car. When the new engine came in we were surprised that the JB was still holding with no leaks.
well, the jb is curing as I type this. If it holds the weight of that big kb after being propelled on 6s and cartwheeling I am going to buy stock in the jb weld company. (Justice Brothers, they make swell chemicals)
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.