Gas resistance of JB Weld

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Bob McCarty
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Gas resistance of JB Weld

Postby Bob McCarty » Tue Mar 28, 2023 11:16 am

I've used original JB Weld for years to fill holes in carbs, etc. Time constraints at Cubfests convinced me to switch to the 5 minute Kwik Weld. At the Louisiana Cubfest the question was raised about whether it was gas resistant or not. I emailed JB Weld and got the response back that the original is if the gas has less than 10% ethanol. He suggested using the JB Tank Weld. I've not heard from anyone that their repair with JB Weld has failed/leaks, but wanted to put this out there. I may make a small wafer of each and immerse in gas with ethanol to see what happens.
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Re: Gas resistance of JB Weld

Postby ajhbike » Tue Mar 28, 2023 11:25 am

Thanks Bob...I use it or the permatex stuff from TSC on just about everything including CChloride leaks on the rims and it has never failed

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Don McCombs
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Re: Gas resistance of JB Weld

Postby Don McCombs » Tue Mar 28, 2023 12:58 pm

Thanks, Bob.
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Re: Gas resistance of JB Weld

Postby indy61 » Wed Mar 29, 2023 12:43 pm

I used original JB Weld to bond an in-tank fuel screen to my sediment bowl a few years ago and have had no problems. One of the best improvements I've made. Thanks to Bill Hudson!


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Dale Finch
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Re: Gas resistance of JB Weld

Postby Dale Finch » Wed Mar 29, 2023 7:26 pm

Thanks for the info.
I used JB WELD to seal a leaking spot welded area where the sediment bowl screws into the tank. Had to build up a bit of a shoulder around the exterior of the threaded "insert" in the tank. So far, no leaking, but guess I should take a look next time I'm out there... especially since I MIGHT have used JB QUICK... :o
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