"I could make a turbo exhaust manifold out of JB weld for my FB, " - Walnuts

Anyway, I was wondering what are the primary uses for JB Weld. It's very hard and is liquid metal. I know there are things you shouldn't use it for and things that are good for it. What are those?

 

My car is held up by jb weld and tie straps

 

well i have a buddy who took his suburban to the shop for rear end issues and it turns out there was a pin hole size leak on the rear diff somewhere - the shop put some JB weld on it and sent my friend on his way free of charge.....so for tiny repairs i guess

 

It's an epoxy. Very strong when using certain materials; metal to metal: good. Metal to plastic: ok. plastic to plastic: nope

 

Alrighty then, Just wanted to make sure so I didn't have maybe a soild peice of JB weld fall off and get caught in something that it shouldn't have. Thanks!

 

well, don't make a manifold out of it.

 

+1

All information on epoxies applies in this case.

Epoxies do NOT like heat.
Don't even think about using this stuff near exhausts.


-Ted

 

You shouldn't use it on something that will vibrate on a regular basis.

 

It's just a strong epoxy for bonding steel to steel. You can also use it to bond other things, but it won't be as strong. It will fall apart under high heat and strong solvents will dissolve it (like acetone, I think). I've heard of people building things held together only with JB-weld, but I've learned not to use glues, solder, etc. to hold things together. JB-weld is one of the strongest, but even it is 1000 times weaker than screws or bolts. I'd categorize it alongside duct tape.

Dry JB-weld is grey and feels like hard plastic, because JB-weld is just epoxy (a hard plastic) filled with iron or steel particles. I don't know which, but it'll stick to a magnet. The particles make JB-weld rock solid and hard, but it has the same problem as any epoxy / glue: it doesn't matter how strong the epoxy is if it won't stick well. You need a large surface area for it to be effective. If overheated, it feels more like charcoal, and gets brittle too.

 

yea took me 15.5 hours to redo your bay......