Jim,
Regarding J-B Weld: It is not like most other two part epoxies. The additives in the product impart a very important characteristic: It can be machined (drilled, grinded, sanded and even tapped. Normal two-part epoxy tends to chip and shatter when drilled, can’t be tapped effectively and is extremely hard to sand. J-B Weld, on the other hand, is easily worked with normal home workshop tools.
Just last weekend I had a stripped machine screw hole for the screw that holds one of my car’s sun visors up. I filled the hole with J-B Weld, let it cure overnight, then drilled and tapped to the original size. It worked just great – sort of a liquid Heli-Coil. I’ve done plenty of work with “regular” two-part epoxies on my boat and I know this couldn’t be done with a two-part epoxy (like West Systems), at least without additives.
With all that said, J-B Weld is not suitable for a drilling-tapping application subject to (a) much tension or (b) high heat. I figure any more than about 10-15 foot pounds of torque would cause the J-B Weld to separate and heat makes [virtually] all epoxy resins soften – so it’s not going to hold an engine head bolt in with it!
Best, – Matt R.
Hey Jim,
I thought I would mention that Slime tire sealant