There is a letter (not le--er) T in the alphabet. Please use it instead of the glottel stop. It's no wonder that Americans cannot understand the British (or is it Bri-ish) way of speech.

This is a true story: Way back when I was about 18 years old (around 1978 or so) I worked as a mechanic in a small (tin shed) mechanic shop. Most of our customers were lower income and we were always having to find ways to fix their cars on the cheap. Well, one day, this old man drove his old truck in with a water leak. I climbed up under it to see what the problem was and low and behold, he had a huge crack in the side of the engine block. If you added water, it just poured out the side. Clearly he needed a new engine. But sadly he didn't have two dimes to rub together. So I suggested to my boss that I try cleaning it up real good and putting some JB Weld on the crack. We figured nothing from nothing leaves nothing (that song just happened to be playing on the radio at the time) and we didn't see how it could make it worse. So I did. Well sir, believe it or not, it worked. For years we'd see that old man driving his old truck all over town with a free JB Weld repair. Yeah, we didn't charge him for the fix. You never know when you'll need some good Karma.

JB Weld is incredible. While active duty in the air force, we used EpiSeal 20/20 for recovery of damaged aircraft when time was a constraint. We applied a thin coat of the adhesive to each face and then laid a piece of cheesecloth over the adhesive. Worked the 20/20 through the cloth and then stuck the parts together with clamps. The cheesecloth maintained a thin bondline between the metal and never failed us.

Love this test and what a great job you did with filming everything. This test you came up with is very impressive 👍🙂

Thank you John for sharing all your videos! The detail is great!

Cool video. I particularly like how you detail each step so another person could reproduce the results, if desired. Thanks

Hi Jon, I really loved this video mate. Very informative and well presented. I have been using this stuff for years with simple electronic projects and had no idea how strong it was. Much appreciated.

Thanks for the excellent Demo mate. About five years ago I did a "temporary" repair on the exhaust manifold on my yacht's diesel engine with JB Weld. The stresses on the repair site were vibrational and extreme heat mostly and I have to say that JB Weld amazed me to the point that I am still waiting for it to fail.

Outstanding! I have used JB Weld on many projects over the years, so I was interested in what your test would show. Thank you

Fascinating work, I will never scoff at Epoxy again, I know it cannot replace welding in a lot of cases, but it is nice to know another alternative.

Such an interesting test - Props to you and JB Weld!

Came for the Tie Fighter, stayed for the glory of epoxy. Thank you for the demonstration, explanation and factor diagnosis. Great video!

Very impressive test, I would never have guessed that JB Weld would hold that well. Thank you.

For Automotive structural joints, often the choice is between a welded or a bonded (using adhesives) joint. However, with the adhesive joint there is usually a preload clamping device in place while the adhesives cure, many times rivets are used (sometimes spot welds), where they remain and are not removed. From a design standpoint we have different unknowns which factor into the quality (strength) of the joint in how it is loaded. With aluminum welding can reduce the maximum tensile strength in the welded zone (heat effected zone), but there are many variables as to the magnitude of this reduced strength such that the joint safety factor is increased to compensate. This can add weight, which is not beneficial in weight sensitive applications. The interesting thing with your demonstration is how the adhesive fails. The shear is not transmitted to any fastener, because there are none. But if there was a preload device than shear never would be transmitted to the clamping device, because the failure mode strength of the adhesive is so much greater than the preload the force, the fastener would just be overwhelm during failure. In other words, the failure mode is catastrophic and without warning, except of course for the cracking sound before the joint explodes. The better test would be for shear fatigue, because the joint surface area is so much greater with adhesives. So what would be the fatigue life loading and cycles between a common two row riveted lap joint one without adhesive and one with keeping everything else the same? As you mentioned the applications of adhesives are confines to relatively low temperatures as comparted to a welded joint. Although metals also exhibit a reduction in strength with temperature but at much higher temperatures as compared to adhesives.

Went on a camping trip and while towing my camper, my radiator reservoir cracked and caused my car to overheat and my whole car would steam up. Radiator fluid leaked all over. Where I was camping at was 45min deep into the forest. Thankfully, I always prepared myself with a good toolbox with essential needs. I happened to have my plastic welding tool and hooked it up to my generator and spent some time welding the large crack. I made sure it was good and sealed and sanded it down a bit so the surface can bond better. Then I busted out the JB weld and pasted it all over the crack for extra reinforcement, i made sure the surface was clean and debri free. Its been 12 years and this thing still holds up like a champ.

Wow what a Great video with so much information . This was definitely a TRUE test done the right way ! I truly appreciate you taking the time to preform this rest and then sharing it with us !

The bonding strength can be improved somewhat by "roughing" the surfaces with an abrasive wheel. I use a 3M Paint and Rust Stripper abrasive wheel for gluing metals. I find JB Weld quite good.

Amazing testing! Great video, would love to see more of these

Great test. Well done. Thanks for your work on this and sharing it. Keep up the good work.

I love JB Weld! I've used it for years and it's never let me down. I decided to watch some testing videos and this one is great! I was actually surprised that it held up under that much actual pressure. Gave you a like.

Great result opening up many applications. Might be good to see how differences of extreme ambient temperatures affect the bond. Also removal of the zinc plating under the bonded surface.

Just a quick note - I cannot in any way advise on individual projects. As with most things, engineering can sometimes be complicated an a one word answer is not applicable without knowing the project in detail. Refer to the caveats at @8:00

My first real encounter with metal filled epoxy was in 1982 when on the road with my friend in his Datsun 510 (the "Rotsun"), my dad recused us by providing us with some Devcon product to repair a leaky radiator. He warned "you get that to a radiator shop ASAP". Turned out Jim never did any further repair, and sold the heap on several years later. Many a dirtbike has had engine cases put back together with JB Weld. I did this with my daughter's Honda she flicked into a boulder pile. Well I remember her thinking she'd killed it for good - hot oil on the rocks. We carefully collected all the pieces and that night I put Humpty Dumpty back together again. BTW, I've had very good results with "G-Flex" toughened epoxy for bonding various plastics. These joints need to be flexible and strong, if not as strong as the components. I use a variety of fillers, lately I tried the powdered PMMA that is used for artificial nails (!). I like it.

JB worked wonders for a hole patch on my MGB floor panels. I had two small pin hole rust stops, cleaned up and the stuff works as well as anything out there for that application.

Awesome testing! I love it! It is - after all - still a type of glue. And glue has certain properties that make it excel in one load type and pretty much suck an another. All glues love shear forces. All glues hate tension. And worst of all: Peeling tendencies that combine tension with a stress riser. It is the task of the designer, to enable the first and prevent the latter. Your test is primarily shearing. The side pipes turn a little but then carry all the load on the inner edge. This is why you hardly see any peeling. If they were longer and would bend and turn under load, the peeling action would be much more pronounced.

JB is one of a kind. I have made several fixes with it on many different materials over the years and only the ones in vehicles eventually failed. If it isn't subject to vibration it holds forever.

Great video I will definitely look at using the stuff if I need it for anything in the near future,

It would be cool to see the same test with the same set up, welded together as a direct comparison!

The cross member of the press trying to fly off was an eye opener - - there are occasional times when I'm leery running my own press - - adding top bars would perhaps offer some restraint - - I'm going to employ that idea when I think it might be helpful going forward. My personal experience with JB has ALWAYS exceeded my hopes, it is a crazy good product - I always keep an ample supply.

[thank, you for you're video. I, have used jb weld on a hole on a oil pan that was used on a truck and it is still holding up now after 7 years now.]

Outstanding test video, thanks!!

Yep...JB Weld is amazing stuff. I've used it for years repairing motorcycle cases, radiators, etc. Use common sense and prep surface well. It's not great for all applications but will usually get you by in a pinch until you have time for a proper repair. Although I repaired a leak in a KTM radiator 23 years ago and still perfect even with all the heat cycles.

Great test Jon, I had a good chuckle when it let go! My test was not as in depth, but I could see that in my application and the saddle surface area a long with the rivet nuts, I'm confident all will hold up well. Thanks for your original vid. I no idea that the chassis could fail by the shifter. Really looking forward to your vid on the race cage. Ross

Great job. Very informative. I have to attach a winch fairlead to my jeep bumper. I’m going to try JB Weld. Thanks

Interesting test. Thanks for sharing!

One of the best from many professional points of view!

Had very good service using JB weld never failed me yet. Had a farmer friend repair an injection pump for diesel had cracked housing. Used JB to glue it together and its still running 20 years later

A very useful analysis of a basic "DIY" product. Thank you.

Wow that was crazy. Good on jb weld. I always wondered how strong it was. Great video and great test. It seemed really fair. 👍

Your channel is quickly becoming one of my favourites! Absolutely crapped it when the epoxy let go 🤣

This word saved me from going from adhesive to adhesive. I have learned this amazing thing. Whenever it is finished I get another JB Weld.

Impressive presentation and results. Thank you.

Thanks a bunch for doing this test. I'm about to build a bike trailer and this will save me a lot of money and time.

That's very interesting! And great results! I'm investigating how to make a DIY oil filtration centrifuge (to filter alcohol from dissolved printing resin). Most demos I've seen show it made from steel and with welding. But since I have no welding skill or experience I'm considering alternatives. One is to make it out of plastic, and on paper it seems to be still possible (with appropriate sizes). But if JB-weld is this strong I'll be able to do it with stainless steel. There is only one rotating part (attached to a motor by a single axis). That part - inner spinning cylinder - has roughly cooking pot shape. The main difference (besides having no handles :)) is having a ridge partially narrowing the top circular opening. That ridge if cut just to fit inside the inner diameter of the top opening wouldn't be affected too much by the spinning force (I'm guestimating 3000~5000 RPMs), because the ridge ring would be held by the cylinder wall like by a hoop. Same goes for the bottom, which is going to be a full circular plate (with only few holes drilled in it - one for mounting the rod used for rotating it, and 2-3 drain holes for the dirty fluid). The bottom of the housing also have couple of specific circular ridges, to keep 3 separate areas - for clean fluid, for dirty fluid, and the inner most a hole for the rotation rod - but the housing wouldn't rotate so it doesn't need to be very strong. If this JB-weld works even half as good it would be few times stronger than what I need :)

Thnx for the upload, pretty informative.

I have this really old single-cylinder air-cooled 2-stroke outboard motor with a broken skeg. I was planning on taking an original good condition Scag up to my old Junior High School metal shop class and have some new ones casted out of aluminum. Then I also got the idea to attempt to make the entire skeg and lower gearbox cover out of JB Weld. Mix it up, pour into a mold, sand down the mating surfaces and screw holes, do the little blue paint on it and see what happens. Your video just made me want to make that idea happen sooner.

Thanks for this video, I love your explanation, especially with the explanations and models of a structural engineer. I have a blown out hole on a carbon ebike frame of 1 of 6 motor mounts. Since the manufacturer doesnt want anything to with garauantee I am going to dry this JB weld and drill a hole in the middle. I hope it works.

Great video, I've been enjoying your scanning videos for a while now, and saw this whilst scrolling through. I've been thinking of using jb weld as a liquid shim. As a bonus it's good to see how well it adhears to simply preped metal.

Wow great video... Not many focusing testing structural integrity of glue and epoxy. A other guy on UKposts did a similar test for creating a drill sander. JB weld came out on top yet again as the best epoxy for the task.

Nice documentary Jon.

very informative video review, i hope to see your next video about impact/shock test using this stuff... well done my friend

Years ago I knew a guy who worked on the old Volkswagen Beetles. He had one that thres a rod and poked a 2 inch hole in the crank case. He replaced all the parts necessary and cleaned up the blodk in the ares of the hole. He thentaped some cardboard inside the block to cober the hole and patched it from the outside with JB Weld and It worked. The last time I saw the car about a year later it was still running with the patch in the blodk. JB Weld is tough stuff!

Ive fixed many things permanently with good surface cleaning and proper application! This stuff really is quite amazing @ what it can hold up to if done correctly. Ive had things fail as well but you never know until you try!

Thanks for the video I had always heard this stuff works great if you clean steel mating parts well it sticks to fresh steel. I have a situation where someone drilled out a bolt hole for a shock mount larger then the bolt it would move up and down making a clunking sound when driving. Normally with this I just find a big washer that fits the new bolt with tight tolerance and weld it over the existing hole making the bolt fit tight again. The problem is the fuel filler hose runs right by this while I might be able to rig up a shield I rather not use a mig welder near a gas tank, and rubber filing hose. I'm going to try JB weld I will take a wire wheel and clean the steel on both mating surfaces. From what I seen in your test 4 tons should be more then enough to hold a shock mount on a Honda Pilot. I did notice the bolt got some JB weld on it as it tightened down I removed it again and cleaned it put some oil on the bolt keep the JB weld from welding the bolt into the hole. Probably could use some grease also.

Cheers Jon, interesting stuff, nice experiment and video. New sub here

Been using JB for about 20 yrs, its awesome stuff, if i want a perm fix its my go to adhesive, they do many forms of it too, like JB Quick for a fast bond

A great product I've even used it on engine block without failure thumbs up to a truly great product

JB Weld is always impressive in my experience. It will not do EVERYTHING a weld could do, but it's still very versatile. I have even had the putty perform well, but mainly used that in compression and put screws through it.

Very impressed with your meticulous technique. For a future project, it would be very interesting to contrast compare these results (JB weld) to a few other scenarios, such as welding or bolting these pieces together. A lot of car reviewers mention how many cars are replacing welding with structural adhesives, so it might be interesting to compare the failure characteristics of those two scenarios.

That fracture was AWESOME 👌 thanks for sharing your fun bud glad the sims came out looking more trustworthy. Deformation discrepancy might be down to the fixing conditions in the sim not allowing the bottom beams to rotate so they react the moment differently🤷‍♂️. Awesome work.

JB Weld is good stuff... I've always known that, but now I know HOW good it is... I have used it to bond some things in firearms with great success and now I have even more confidence that those bonds will endure.

I found that JB Weld seemed to outperform pretty much every other epoxy that I've tried... and. of course, the fast-cure ones are pretty much 'plastic'... and, indeed, certain materials just don't 'wet' well, and are rather hard to get together. I had quite the argument, about 30 years ago, about adhesives, versus welding, for assembling a large opto-mechanical system, and I was convinced that the large wetted area of a tube mounted to a curved surface, would give large enough retention, without all of the issues that welding make for distortion and retained stress... sigh. But, even at that time, adhesives were being used for precision optics, using 'cure-in-place for accurate alignment/centration, and reduced cost. Great video!

I have used J B Weld to repair holes in small motors for many years I have two engines with 15 years of running and vibration with patches on them that as far as I can tell are as good as the day I put them on. Preparation is the key if you take the time to make sure the bonding surfaces are completely clean as you did in your test the stuff is pretty amazing, roughing the surfaces with sandpaper makes it even better. They have a putty mix called Steel Stik that is 4000 PSI and will withstand temperatures up to 300ºF. you can file drill tap it just like metal.

Interesting test, thanks! I'm not familiar with that simulation software, so I'm wondering if the force applied in the sim is tantamount to the gradual application of the press, or if it's simulating impact at that force (i.e. a sudden force vs. a gradual one).

Excellent test I used MTS Load Frames to test many things, but never JB Weld!

Wow, a PROPER engineering channel, thanks!!!

I have a 20 year old two stroke Lawn Boy mower that still runs like a top but the deck is showing its age. I keep it repaired with JB Weld and it has never failed me. The stuff is great!!.

Great video. Here's some engagement for you. Thanks for sharing.

Used it to fix rust holes in a fuel tank once. JB weld is known as metal re-enforced epoxy. Kind of how hard angular aggerates enhances the sheer strength of concrete

What a lovely bonding moment.❤ But seriously, that was really cool. I have a current project that would benefit from this stuff.

We use an epoxy at work called metalset but we have used JB weld in the past. If you drill holes through the glue section on both pieces and allow the glue to pass through and sag while it's curing it holds much better. It becomes more like a mechanical bond we've even reached in and smeared it where it has passed through the hole to give it even a better bond. We have noticed mixing thoroughly or not changes the bond significantly. We have checked out the glue they use to bond an aluminum car frame together. The name of the glue I can't remember at this point. Extremely expensive works very well but if you need something to hold together that well weld it.

I had a Ford v-6 some years ago where one of the spark plugs blew out. There was enough thread left in the aluminum head to feel threading the plug back in, but finger pressure was enough to pop it out. I put some JB Weld on the plug, threaded it in loosely, and removed the plug, which left a trace of the stuff on the head. After that cured for a day, I put more on the plug and threaded it back in - only finger tight. I let that set for a couple of days. After that, the engine started and ran normally. I traded the van off a few months later, with the engine still working normally. Never had any problems with the plug. I have used JB Weld for more than fifty years. It always works.

That’s awesome! I’ve never seen a test before that closely confirms it’s tensile strength. When using epoxies, I usually perform a mental calculation to estimate its suitability for the repair. Now I can really trust it. Time to go jb weld my bicycle back together. Very nice!

What a great video. Thank you

I am fascinated and interested to learn more.

So good explanation

I used JB weld to repair aluminum railings with missing spindles at work. I tested it first on new extra pieces of square aluminum tubing. The aluminum surface is naturally oxidized, even when it is bright and shiny. So, I cleaned each bonding surface with a wire wheel, then glued and clamped the parts overnight. The next day I tried pulling the pieces apart. None of the glued joints broke. I could break pieces of the aluminum off, but the joints remained intact.

very helpful presentation! would like to see what 1 ton load for a few days looks like!

Epoxies in general are just amazing.

Two thumbs way up!! Well done!

Great work!

That's insane Just ordered some

It's strong, but it's shocking that the Titan sub's end caps were glued on with it. It would be interesting to know how it holds up over time of being under stress cycles like the sub was putting it through.

Helpful demo-Excellent thanks for your effort l use JB weld on my sail boat for small repairs. one area it failed was trying to lock-in a key into a wind generator hub it-can’t take the torque of the boats wind generator over say a month it failed?

Sweet, a quality yt channel. Thanks for the video

Great product if you stay within a specific application . With that in mind it has never let me down .

Hi, I took a 5/16th bolt and used a 3/8ths anchor filled with jb weld (the stick type "Steel Stik") to see if it would hold. I filled the anchor and the threads in the bolt and let it dry over night. I had access to a machine that tests break points. I was able to pull it until it broke and it didn't fail until well over 10,000 lbs of pulling force. So about the same, maybe a little higher because of the threads.

I used to cure gauss sensors in JB Weld, then machine the JB weld in a threaded housing and then run the sensor in an elevated temperature environment. Never had a single one fail. Hundreds of them. It’s amazing stuff.

When I was 17, I skeptically used JB Weld to fix a crack in my radiator and it held for 2 years until I got a new car. This was also in 05 or 06, so I'm sure further improvements have made it even stronger.

JB Weld is an essential part of my "MacGyver Kit" aboard my sailboat, along with duct tape and wire ties. You can fix anything with JB Weld. My best example is a "temporary" fix to the timing case of a friend's Yanmar marine diesel. That "temporary" fix has held for over 14 years now. :-)

Great info. Thanks!

Excellent test and certainly a great product. I’m curious what the test results would’ve been if the beams had been MIG or TIG welded

Great video. I had a laugh when it all exploded. I wasn't expecting that.

I use JB Weld and JB Kwik for tons of projects. It's extremely versatile, machinable; all in all great epoxy for reinforcing or even sculpting parts.

I was putting a thermostat in my van about 25-30 years ago and snapped off one of the ears on the cover 🤬. I couldn't afford the real Ford replacement at the time so I JB Welded the ear back on. This worked perfectly fine. I eventually found an affordable generic thermostat cover and replaced the JB Welded one but probably didn't need to.

Awesome video bro!

I'm not an engineer or professional but I put a diesel engine water pump back together with JB Weld that had broken into about 6 pieces. I put it back on the engine the next few days after it broke. Cranked it up and it n2ver needed to be exchanged for a new one. Though a new water pump was ordered it stayed on the shelf. That's amazing. If I were you I'd rough up the surfaces as adhesion would be much better.

I'm about to flip the gun world upside down! Thank you mate, great show!

Been using JB for decades and it is the go to for a superior bond. Oil free and scuffed surfaces work the best.

I'm interested to see if you sand blasted the surface, hit that with break clean and THEN glue it. It's all based upon surface prep and mixing. Sand blasting would increase surface area quite a bit and give the glue something to grab onto.