Mechanic Reacts to JB Weld Nightmares

We asked real mechanics to break down some of the worst uses of JB Weld we could find on the internet. And no, this episode is not sponsored by JB Weld.

Huge thanks to our experts!

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[Nefville]

Sandro is so good him and the boys built an entire car out of JB Weld once.

[Sclimenti]

I see Sandro. I watch its that simple. He's one of the boys 😂

[NoGuaranteesGarage]

The guy with all the tools doing JB Weld body work is probably a professional trying to show people how it can be done without welding

[ツッ]

We need to see what Sandro would do if he had his own channel 😭

[Marc]

In about 1976 I used JB Weld to seal a crack in an oil Olds. I had that car until 2000, and the repair held.

[deaks]

It's rare to see Sandro left speechless, so props to the JB-Weld Cylinder Guy for managing that.

[Ky_Mycology]

Sandro is the reason I've been a tech for over 20 years. Love working with guys like him. He's the dude in the shop that makes the job worth going to every day. He's quickly became my favorite Guest Donut speaker 😅

[joevk]

Years ago, I worked at a parts store. I was sent to deliver parts to a local shop. When I walked in, there was an insanely clean first gen S10 sitting in the shop with the little 2.8L torn down to the block. I commented on how clean it was, and the guy said "Yeah, too bad the owner's a dumbass". Then he told me he had to replace the driver side head, because the owner had cross threaded one of the spark plugs when doing a tune up. Instead of fixing it the correct way, the owner used a regular helicoil to put a (incorrect) spark plug in it. That blew out shortly after, so the owner and his buddy decided to remove the remainder of the destroyed helicoil, and just JB Weld the plug in the hole. Then the owner decided to rev the engine, and the spark plug fired out, ricocheted off some stuff under the hood, and smacked his buddy square in the forehead. I would've paid money to see that.

[RILDIGITAL]

Appreciating the ingenuity and creativity in the use of JB Weld. Clearly, it's not an end-all solution for every car problem but it can surely be a life saver in certain scenarios.

[Enraged-Gecko]

The penultimate clip was legitimately impressive. The work was practically indistinguishable from an undamaged door panel.

[darkindy]

I love how non judgmental Sandro is. He will tell you it's dumb, but he gets sometimes you just need to make it work for a hot minute.

[pyrogaming]

"my homeboy never noticed it" sandro is the best

[damcleandetailing]

1:48 Red Font

“But seriously, if anybody at JB Weld is watching this, we love your product and you should reach out to us.”

[Demo]

That JB Weld cylinder was on a two stroke engine, meaning he didn't need to figure out valves and whatnot. Also my guess for how he made it was that he made a mold and put a cardboard tube in the middle and the appropriate bits for the ports from the crankcase and for the exhaust, filled it with JB Weld, then removed the bits for the ports and cylinder then honed the cylinder to make it smooth.

[Yetr]

Sandro is a legend. The guy knows how to work magic with JB Weld!

[edreichfl]

The look on Sandro's face with the JB Weld cylinder was priceless

[BatCaveOz]

Brett seems like a cool guy... but Sandro and Angelina are the dream team.

[Bamfhammer]

I 100% JB Welded an exhaust manifold before.

I was participating in a race, we blew a stud off the manifold and could not extract it from the head without taking the entire motor out, and even then, maybe not. So we JB Welded the manifold on to the head and finished the next 7 hours of the race. We did lose some power because it wasnt perfect, but it was better than what initially happened.

[crazylarryjr]

I got two stories where JB weld saved projects.
First story, my brother was building a 318 dodge to put in his first car ('78 aspen) and misread the torque for the harmonic balancer as In lbs not ft lbs and tore the threads out of the crankshaft, he and my dad took the crank bolt slathered it with JB weld and put as much in the crank hole as they could. They then put the bolt in and snugged it down. next day they tightened it a little (not full torque specs but tightened it up a bit), the completed engine run for 5 or 6 years till a water pump bolt come loose and leaked water into the engine (killed the rods and mains). we took it apart and removed the crank bolt and what was left was perfect threads that never broke. By brother built that engine from my dad's junkpile so it was already going to be eventually scrapped, so no loss if it failed. BTW this was early 1990's
Second story, my hobby is RC cars and this was in the mid 2000's when Brushless motors and esc's were starting to redefine the power and efficiency of electrics. Anyways, i had a motor that started slipping and vibrating, so took it apart, the magnet was separated from the shaft I took JB weld and packed the hole in the magnet (cleaned it first of course) . set it to the proper spacing and set over night worked perfectly ever since

[jackryan]

15:01 very possible that he's helping out people who don't have a welder and/or don't know how to weld even if they had access to one. He's showing an alternative way to do it and get the same badass results