We have a epoxy that blows JB WELD away too. Its called "Epoxy Putty" its made by Valco Cincinnati Consumer Products Inc.
Valco was also started in 1952, Though the consumer products division wasn't started until around 1990.
Epoxy putty is fuel proof, oil proof, can cure under water. cures full strength in one hour. Holds 18 ft. lbs. of torque on 3/8-16 thread without issue. I have seen it hold up on a cracked catylitic convertor but its only rated for 500 degree's. Also excellent for head & intake work. part number is 710XX636 and retail is $5.90 for 2oz 2 part tube. Of course case price is much cheaper for dozen qty.
It is a very amazing product. The shifter knob on my Super Case muncie equipped 69' Firebird is held on with epoxy putty and its been used and abused with powershifts alot!
More at www.valco-cp.com