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J-B Weld makes for some pretty entertaining conversation. Without fail, some will insist on its inherent evil while others sing its praises. With something this elemental there’s no middle ground.

I’ve never used the stuff before, but since it falls into the epoxy/superglue category I’ll admit that I lean towards the pro-JB Weld crowd. It looks like pretty cool stuff.  I see pictures of its overuse, like with other epoxy resins, for everything but curing cancer — so I get the feeling it can’t be all bad.

How does the Toolmonger readership stand on the hotly debated J-B Weld issue? Is it goop from the heavens or just another way to do a project incorrectly? Let us know in comments.

J-B Weld [Website]
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87 Responses to Hot or Not? J-B Weld

  1. salsa says:

    Wait… there’s an anti-J-B Weld crowd?! The fact that J-B Weld is generally used for repair will trump any “epoxy is just plain evil” arguments against it.

  2. Patrick Austin says:


    It should be the last resort, but it’s a mighty good last resort to have sitting in your toolbox. Best part is its fairly good heat resistance, so you can use it in all sorts of oddball applications. It’s holding a piece of ceramic together in my Big Green Egg cooker that regularly sees 800+ degrees F.

  3. jeremiah says:

    my father repaired an engine block on a tractor with it once. before he applied the J-B weld it would spray coolant out of a crack when it warmed up. he took it all down, made sure the crack didn’t go into the cylinder, put it all back together and spread some J-B on the outside of the engine block with a small putty knife. that block never leaked again. some 20 years later that tractor is still going with the same J-B weld patch.

  4. Chris says:

    Definetly hot. It is indeed a last resort and not necessarily a permant fix. It was my only option to mend my garbage disposal on Thanksgiving day. I replaced it as soon as I could buy a new one but the JB held for a couple of days and there was no indication that it would fail anytime soon.

  5. Toolaremia says:


    Like all glues, it’s about the right application and properly preparing the surfaces, not to mention following the instructions. For the jobs it’s intended for (almost anything), J-B can’t be beat. It’s heat and chemical resistance make it a winner in the garage.

  6. Alfonso Bedoya Jr. says:

    Hot, but even Hotter is J-B Stik. It’s a epoxy putty that you knead to mix the two parts. You can stick it in places that regular J-B Weld will run off from and you can form and shape parts from it. If you have a broken part on something, you can roll the J-B Stik into a flat sheet, wrap it around the broken part, and it will hold it together. I always carry a tube on my motorcycle – if I can’t fix it with J-B Stik, it’s really, really broken.

  7. Adrian says:


    JB Weld is quite possibly the greatest substance known to mankind.

  8. Andrew says:

    HOT. Used, like the tractor example above, in the engine block in my last car to stop a leak.

  9. samk says:

    i’m with the first post… i didn’t know there was anyone who didn’t love jb weld. what’s not to love?

  10. Harley130 says:


    I knocked a hole in the oil pan of a Honda motorcyle once and repaired it with JB Weld, I owned it for 5 years after the repair and sold it to another guy locally. He is still riding the bike and the repair is still holding.
    P.S. He knew of the repair when he purchased it.

  11. Mr. Peepers says:

    I have repaired many things with it. Just clean/rough up the mating surfaces, and you’re good to go. I even fixed a toilet with it once.

  12. FourMat says:

    I have used JB weld for so many projects I have forgotten most of them, from repairing cars, to doing prototype work for a 3d cad/CNC machining system, it really has no equal. I’ve even used it to create a small prototype injection plastic mold. I created the frame from concrete and used JB weld as a filler that could be machined into the right shape quickly.

    I used to work in NASCAR as a fabricator and I can say for sure that those guys use the hell out of it and other equivalent epoxies. So I definitely say it’s HOT.

  13. Gary Webster says:

    Years ago a man traded me a Dodge pickup that had frozen and cracked the block for a half days work. I sanded off the crack and spread on some JB weld when I got there. When I got ready to leave I filled the radiator with water and headed home about 5 miles. The man followed behind me because he did not think I would make it home.

    I drove that truck for 5 years and every time I saw him he would have me raise the hood so he could see if it was the same motor. I sold the truck and saw it around for at least another 5 years.

  14. asbestos says:

    I use stick epoxies a lot, I don’t use JB that much. Is it different from other epoxies? for example pc-7 or supermend?
    They all work well for the “I could spend 4 hours taking this apart,getting the right replacement part (if they have it) or I could spend 20 mins. and have an 80% repair for about $5.

  15. david says:


    I just used jb weld and jb kwik to build up the nose in a rifle trigger. Have use it to repair holes in a jonboat. Yes, a winner.

  16. SlowJoeCrow says:

    I have never had good luck with super glues, but epoxy has always worked well for me. My motorcycle’s fairing mounts have been held to gether with J-B Weld for years.

  17. Michael W. says:

    Hot. Just bought another package last week. Should always be in your shop. I use mine mostly for repairs on tools.

  18. Old Coot says:

    Very hot. I make sure it’s in my tool boxes, boat, and truck.

  19. PutnamEco says:

    I’m going to say warm,for metal to metal. I’ve had better luck with Scotch-Weld, I’ve also had pretty good luck using Red Head structural epoxy. If there is any wood involved, I prefer West Systems.

  20. Dishwasher says:

    Hot. We’ve used at at work (a restaurant) to repair a sink. The patch is almost always immersed in 160+ degree water, and it lasts for about 2 months before needing repair. Beats a new $800 sink.

  21. Pete D. says:

    Hot. It is strong stuff that sticks to almost anything, including every plastic I’ve tried. I keep it around all the time.

  22. river1 says:


    the only people who hate JB weld haven’t used JB weld.

    a side note, a few years ago i took a tour of the Justice Brother (JB) museum and was surprised and pleased to find Ed Justice himself giving the tour. VERY entertaining!! unfortunitly he passed a year or so ago.

    later jim

  23. o1d_dude says:

    I used J-B Weld to repair a crack in the heater core inlet tube in my ’94 Ford Bronco because none of the replacement cores were an exact match. I did this about seven years ago and it has not failed yet.

    (Knocking on wood…)

  24. BadBob says:


    I just used it to repair a plastic motorcycle fender where I could not get epoxy to stick. I saved about $150.

  25. Hamilton says:


    I was pulling a stint in the surgical theater, and some poor old timer stroked out on us. The odds weren’t good since he was pushing the bad end of ninety. We pulled in the crash cart, and Doctor Hendrix worked on him for twenty minutes before we had to call it. That’s when it hit me: I ran down the hall, kicked open the utility closet, and grabbed the JB Weld. We made a small pill, popped it into the cadaver’s mouth, and massaged it down the throat. I’ll be damned if he wasn’t up an dancing the Lindy Hop down the halls in five minutes.

    J-B Weld: it resurrects the dead.

  26. Frank Townend says:

    Hot as Hot Gets – If there was a Nobel Prize for epoxies, JB would win it every year. I love all of their products, each suitable for multitasking.

  27. KMR says:

    The popularity of JB weld is down to two things 1) ease of purchase (you can find it everywhere!) and 2) versatility with good results.

    It isn’t like I can walk into Lowes and buy a specific industrial Devcon epoxy product, but I do have a choice of various types and sizes of JB Weld… which will work well enough.

  28. Jerry says:

    Not quite the “best thing since sliced bread” but good stuff. I once used it to fill in a gap from a warped header on an old motorhome. Just wanted the exhaust leak stopped and the shop quoted me a high price because they said the head and the header were both warped. It lasted at least 10,000 miles – then I sold it and the last time I spoke with the buyer, he said he had added another 7,000 miles with no problems – yes, I told him about the JB.

  29. bender says:

    I’ve had some less-than-stellar results with some imitation brands, but the genuine JB Weld is great stuff. Sure there are things that you can’t do with it (repairing anything flexible or rubbery is probably out of the question) but man, I’ve never had a more versatile tool. I’ve used it for auto body repair, fixing chairs, ornaments, glass, hand tools, and so on!

    So yeah, it’s definitely “hot”

  30. Old Donn says:

    Hot. Used it for everything from sticking badges back on metal hot drink mugs to re-attaching a magnet on the flywheel of my snow blower. JB’s never let me down.

  31. Barry says:


    I fixed a broken “ear” on a Toyota pickup distibutor with it once.

    100,000 miles later, I junked the truck!

    JB Weld is HOT!

  32. Michael Pendleton says:

    I’m with ‘asbestos’ (never thought I would say that!) above: I’m a big fan of putty epoxies, like PC-7 or regular plumber’s putty. I used to build theatre props, and we used PC-7 by the quart can! Since you can drill and tap into it, we used for repairing bolts and threaded holes all the time. I wouldn’t use it in any circumstance where lives might be at stake if it failed, but short of that…

    (also, PC-7 can be smoothed or textured with water as it sets, which is very handy)

  33. fritz gorbach says:

    Used it for everything. . . I work on a lot of old machinery, pumps, and motors, sometimes without replaceable parts. Ive repaired castings, seal faces, bearing races, can’t even remember everything. Ive also used it on cars, trucks, bikes, toys, wood, fiberglass…..While it is almost always better to get the proper part, sometimes it’s just not available, ie obsolete machines, or sometimes it’s just not worth it, ie toys, household items, or sometimes you just need it now.
    Try marine weld, and stick weld, also from JB, and get the industro weld, which is the original, in large cans.
    Oh, and to the one who mentioned the West system…fantastic also. Everyone with a shop should by a can of resin, a can of hardener, and an assortment of glass cloth and mat. Download and read the West manual, and you will use it all the time.
    Oh, and don’t forget the gorilla glue.

  34. Todd says:

    At the vet clinic I worked at in high school, we used it to fix a turtle that had been run over by a car. Rebuilt a major portion of his shell.

    Another small piece of information that I have not seen posted; from what I hear from other home brewers, it is Food Safe. Home brewers are extremely concerned with toxicity and cleanliness, and a lot of people use it in structural applications with brewing where temperatures go as high as 212F regularly.

  35. Noah Ramon says:

    @Todd :

    I WAS NOT aware that it was food-safe – now I feel a LOT better about potentially using it on some brewing projects…
    (Any idea about J-B Stik?)

  36. Don says:

    Hot. Used it to plug leaks in transmissions, differentials, my Jeep’s “air tank bumper”, gas tanks, you name it. Even used it to install a front sight.

  37. Buster says:

    I used it to repair the top of my plastic radiator after it blew and left a big ol crack an inch or so long. Was still holding true 3-4 years later and right before I sold it (told the prospective buyer of my repair)

  38. Bob says:

    I have used this product on a vast number of things and it does a fantastic job.

  39. bob B says:

    I used it to repair a leaking exhaust manifold. It held under extremely high temperatures & harsh exhaust gases for a few months until I junked the car. It was a 15 minute fix that cost me less than $10. It was cheaper & easier than buying a new part or a used junk yard part & installing it. As I just needed that car to last until the end of winter.

  40. Ian says:

    Don’t laugh, but the only time I used it was to attach a magnet to my new Three Stooges Bottle opener so it would stick to the fridge.

    Not high stress, but a critical bond…

  41. fixit miller says:

    JB Weld apllications are limited only to your imagination. I fixed a fairing mount on my Harley, rebuilt a plastic gear on a printer, sealed a crack on an aluminum outboard engine block, many more. My favorite, I made a custom key fob for my car door remote when the ring hole on the plastic one wore out.. so cool, its HOT!

  42. underworldimage says:

    Used it the first time to repair the transmission cooler line on an Auto-Stick VW Beetle. I knew it would be under a lot of vibration so I applied regular JB Weld and then covered it with a layer of fibreglas cloth. after it had partially set I put another layer of JB Weld over it.
    Now I’ve just used it (JB Stik) to repair a hole and a hairline leak on an aluminum oil pan on a Mercedes E300D

  43. Interociter Operator says:

    What I like is the honesty of all JBWeld users on this site. When they have used it on an item they are selling, they let the seller know.

    I think we ought to make our tanks out of the stuff. It’s amazing.

  44. Squidwelder says:


    It will hold anything to anything and it sees extensive use in all manner of ship-based fixits. Some more permanent than others, but they all last just the same.

  45. Dave Sutula says:

    And is there even such a thing.

  46. Isaac says:

    Hot, I bet Chuck Norris uses it. JB Weld is a must have for campers.

  47. BC in DE says:

    I prefer to use J-B Kwik because of the fast set and cure time. It is now my “first choice” adhesive and filler for most projects. Super strong, easy to mold and machine. Does not shrink or expand. Paintable and chemical resistant. Adheres to almost anything. Truly a great product. Highly recommended.

  48. Jake the snake says:

    Used it to repair the rotor on a helicopter which I sold without telling anyone..

    Seriously though, it’s good stuff. Hot.

  49. Tommy Boy says:

    HOT. It is, without a doubt, the best tool any antique car guy can carry with him/her on tour. I have even fixed a broken cast-iron engine block flange with it, through which had to pass a tapered bolt, which was one of several that held the transmission bell housing onto the engine. Nine years ago. still holding. I have drilled and tapped it, and I have used it on small body work repairs where a hole was so small that traditional welding would have caused more warpage and buckling than was worth it. It can be filed to shape, sanded, and painted. It is simply the best stuff in a tube that money can buy, and it is limited only by your own imagination in how it can be used.

  50. browndog77 says:

    And to top it off, what better way to mount that laser you got from Santa? On anything!

  51. Rupes says:

    I used to ride motorcycles a lot, well, needless to say I fell off a lot too. One day I fell off and smashed my front teeth clean out. I didn’t worry, for in my tool case I had a tube of epoxy putty, I needed it together and fashioned two new front teeth. They were a little too long at first, but nothing the dremmel couldn’t easily fix in five minutes. I’ve had the same ‘new’ teeth for 20 years and, now I’m a bit older, they’re all the same grey colour 🙂

    • JOn says:

      Hey Rupes…I ride motorcycles too..still doing it after my first ride almost 60 years ago, but I do not want to meet up with you in a dark alley! You are the epitome of what we used to call “a tough guy”.

  52. jeremiah says:

    i have a 1981 honda shadow vtwin and where the exauhst hooks up to the front head one of the bolts broke off, now its a very expensive fix but would i be able to throw some JB welde on the exaust to the head so its at least ridable till i get my new engine??

    • JOn says:

      On a water cooled engine, it would probably work fine, but if it is air cooled, I would be skeptical as they get pretty hot.

  53. Breck Jordan says:

    JB weld is HOTTT!!

  54. Mo says:

    I just patched my radiator yesterday using JB Weld. I now have my aircon on fullblast and havent experianced any leaks so far. 3 years ago I repaird the engine block on the same car. I live in the outback where its quite hard to find parts.

    JB weld is hot for me.

  55. yodawgiheardyoulikeglue says:

    JB Weld doesn’t hold up to shearing forces all that great, you need to get EP31 or something like that, or just replace the part. But for patching everything in my house from electronics (it’s non-conductive even with the steel powder) to cars to furniture to toilets, JB Weld saves the day every day.

  56. John says:

    Hot. I once fixed a 2 inch crack in a magnesium cover on my 99 zx9r I put a v shape in the cover and let it set started the bike never had any leaks from that engine again

  57. Hot. I patched a small corrosion hole in my A/C system condenser (in a car). I sanded the outside with rough sandpaper first, then used a dental pick so I could open it up to about a 1mm hole, to allow some solvent in there to clean any oil, then worked it into the hole with the dental pick to make sure I got it underneath so it wicked on both sides and sealed it (it will self level very well on top and bottom once the surfaces are wet with JB weld). Then I filled it more, and covered it with a piece of aluminum I cut from a gutter, to which I had added lots of tiny holes, just so the epoxy would have multiple places to really grip both sides and give it more structure. Then I covered that. I also left the system open so no residual pressure (if any) could build during the 24 hour cure time and blow the epoxy out. Even at 400 psi max high side pressure (this was low side), the little 1mm hole only needs to resist about 1 lb, and I gave it plenty of backup with the aluminum piece. The patch covered about 1″ square. Evacuated and refilled, it was fine until I sold the car. Saved me a few hundred. Epoxy is not uncommon in A/C system repair from what I hear.

    I also used it to fill drilled holes on a car I restored. It had holes drilled in the vehicle where things were mounted to the body (a safari vehicle). First file the hole so it has a good radius on both sides to help hold the thin JB weld section. You can apply JB weld to clear shipping tape, then put the tape over the hole, which squeezes it through. If it’s a blind hole, just let it cure. If it’s a hole you can access, you put tape on the other side too and let it cure. It makes a nice little pressurized sandwich of JB weld that will cover over both sides. After cure, peel off the tape, and file it flat (or block sand it). Stronger than bondo (which is also an amazing material). Good for small holes, but for anything over about 1/8″ I would advise welding shut instead. In either case, you can’t leave any rust behind or the joint will fail in time (the metal will fail if it can rust, not the JB weld). So paint it well with good primer and paint on both sides, then it will last forever. Cool stuff.

  58. Dave says:

    I had to repair a hole in my car’s oil pan about 15 years ago and used JB Weld. To make a long story short, I had to cut a small window section out of my oil pan (which was in the shape of the letter U.) The rotary tool cuts were about 1″x 1″x 1″ My Ford distributor drive shaft fell off and landed down in the oil pan and the only way to get the pan off was to jack up/lift the engine, which I couldn’t do based on my circumstances. Anyway…without getting into all that…I made the cuts to get the rod out, then bent the oil pan back into place and sealed it up with JB Weld. Its been like that for over 15 years and never leaked at all. So, yes, JB WELD if done correctly can hold up to a hot engine oil pan.

  59. Dale Pollekoff says:

    I am using light bulbs in an art project. Though they are low voltage, and only 7 watts, they are hot when the filament is lit. Their lower halves (including glass bulb, metal base, and wiring) must be submerged in a heat resistant clay-like medium. Could I use JB Weld for this, does anyone know?

    • BigPeach says:

      Well jb weld wont be “clay like” when it hardens but as long as it doesnt exceed 500 degrees it should be fine.

  60. teresa says:

    My boyfriend just used JB kwik to repair my 01 grand am.The bolt that holds the belt and pulleys on broke off in the cylinder head.He drilled out the hole and got the rest of the bolt out.There were no threads left in the hole so he put jb kwik weld in and put in a new bolt to rethread the hole then took the bolt back out to let it dry.We waited 4 days to make sure it dried and he replaced the bolt and put everything back together!I seriously hope this works:/We’ll see:-)

  61. Smiley says:

    I have a 1973 aristocraft boat went to Change oil and the nut in the oil pan that the plug screws it to broke off I the pan now I have hole in it I can’t screw the plug in so I got a copper coupling 1.5″x3/4to make it round again then jb weld it all the away around then I bought a foreman expansion plug to hold oil and drain next time My question is will this even work anyone know

  62. Carl says:

    I am looking for some Plastic Steel To Fix a Broken Tank I can’t get a tank so I’ll rather fix this one, Carl, 437.886.3503 I live in Toronto,


  63. Dean Howard says:

    Can J B Weld be used to repair a small hole in a fire box
    (fire place insert)with a piece of sheet metal cut to do the repair?

  64. ugbo says:

    i used JB weld severally on my cracked mack pinnacle series 07 block engine, it did not hold can someone give me a better solution.

    • Robinhood says:

      Ugbo,did u thoroughly remove all remnants of lubrication as well as drain the block completely ? If u did this and scuffed the crack area, then wipe clean again, u should hv had no problems. Also, u hv to apply w even smooth, then layers for cracks. Apply 3-5 thin layers every few minutes.

  65. Brad says:

    Amazing! The driver’s window regulator in my wifes buick has a cable and trolley type setup. Some JB, brake cleaner, 150 grit, and a popsicle stick later, the top pulley is working like a boss! Probably better than the original nylon pulley to be honest.

  66. CARL says:

    l use to know of a poor guy who bought a used lawn tractor.
    the valves seats where shot on the engine..so he fabricated new ones…worked thereafter just fine for two years after many mows before he moved

  67. Matt M. says:

    Using jb stik to fix a small hole in the side of my engine block where the water pump is housed. Its a son of a gun getting to the spot to evenly distribute the stuff, but if it works its gonna save me TONS… minus the $7 and change for the jb. Here’s to hoping… fingers crossed.

    • Larry Masters says:

      How is that working out Matt?
      I’m actually repairing a thermostat housing in my engine butt it’s cast aluminum alloy.

  68. Lynn says:

    I have leaks dripping from the bottom of my transmission oil pan in my 18 yr old truck- it’s getting a bit corroded. I only plan to get this truck through winter so want to avoid the bill of new pan/labor. Would JB Weld and some sheet metal help here?

  69. Matthew says:

    This stuff is hotter than the sun in my book. It’s holding a spark plug in my truck, last owner stripped the hole, and has been since I bought the truck 5 years ago. Still running strong and hitting every lick. Good stuff

  70. Kev says:

    Not, unfortunately.
    I wouldn’t trust anything mechanical with this applied. For filling and covering cracks, fine, but for holding 2 pieces together, no do not trust it. JBWeld is like a spare wheel, it’ll get you home but you take it off as soon as possible. Its strength inconsistency is worrying when I see what some people will attempt to fix with it.

  71. Fatbone says:

    Ive used it for all kinds of auto repair but the most interesting use was this. As well as being a mechanic I was a master jeweller and diamond setter for over 25 yrs. When I just started out I couldnt afford proper casting equipment so I built my own. The vacuum head to pull the liquid gold and silver into the mold I built out of bits of steel pipe using JB Weld. It was supposed to hold together for a few jobs until I could buy the “real” stuff. The molds come out of the kiln at over 1300 degrees and sit right on top of this Franken-machine built of bits and JB…plus it has tremendous vacuum applied to it as well. I made it when I was 19 yrs old and Im now 47. Ive put thousands and thousands of molds through that head to date. I recently totaled my earnings for that period while I was working full time and estimate that that casting head (a pack of JB and some junk steel…total maybe 20 bucks) has made me just over a million dollars in 25 yrs. And I still have it and used it to make my wife’s wedding set 3 yrs ago. Hows that for return on investment??!! JB Weld is hotter’n the hinges of hell in my opinion and I always have a pack on hand. *Drops mike*…lol

  72. happy boy says:

    I want to try this. I’ve never used it before so I can’t say if it’s hot or not. Maybe one day i’ll try it. Can’t wait to try it.

  73. super STUD says:

    I used this to glue my friend’s refrigerator door closed as a joke. He was not amused.

  74. butt cheeks says:

    I glued my butt cheeks together with this product. Seriously.

  75. blarkk says:

    Hot*. The asterisk is for my forgetting that JB Weld actually has steel fibers in it when I tried to reattach a magnet. That got messy.

  76. JOn says:

    Especially, I have found extremely useful the way the JB Weld flows before it sets…it becomes self leveling reinforcement, penetrates cracks, flows to help distribute stress, and has amazing adhesive qualities. It is easy to dam with masking tape to re-enforce weak or broken surfaces. Great stuff!!

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