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Old 09-10-2019, 08:38 PM
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Cracked manifold and jbl extreme

I have a cracked driver’s side manifold in my 08. Looks like a spider web and gets quiet when hot. So I bought a bottle of the jbl extreme and tried it. I didn’t really want to do the manifold replacement thing as I’m doing brakes, u joints, and waiting on a gas tank skid.
I’m a licensed wrench in Canada so I have a pretty good knowledge on how to do stuff. I followed the steps ie. Sand , grind , clean and apply. It looked good in the beginning, like a smooth pancake, but after a drive around the block, waiting on skid so being careful, it looked like a sponge. During another around the block tour it now has grown bubbles. They haven’t popped yet but! So I’ve emailed jbl support and am waiting on them. Seen a few YouTube videos with people having the same issue. Pictures are showing before the engine was run and the second after the last drive.
Any ideas?

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Old 09-12-2019, 12:52 PM   #2
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I suspect it wasn't fully cured.(hardened)

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Old 09-12-2019, 02:54 PM   #3
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I have also found that if you mix JB Weld too aggressively it will trap small air bubbles in it. Could be trapped air bubbles along with the recommended generous application that caused the bubbles to grow during heating.
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Old 09-13-2019, 06:13 PM
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Stirring and bubbles. That sounds possible. I thought about that when I was stirring. Didn’t think I saw any or stirred to fast but it doesn’t take much to make some.
The time from the first 10min run which didn’t seem to show bubbling and the 2nd run was about a week. You would think it would be hard as it was going to ever get and not bubble. Almost like it softened up a bit.
Emailed jb and they past the pics to their chemistry dept as support had no idea.
Update on when they respond
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Old Yesterday, 04:12 PM   #5
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If the first 10 mins warmed it enough to harden the surface it may have kept the inner portion form curing.
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