The Ultimate Epoxy Competition--Which Epoxy is the Best? 

Thank you all very much for the positive comments and for the future video ideas! Here's a list of the products tested. Recommend shopping around for the best possible price. Thanks again and best regards, Todd Gorilla: amzn.to/2QgH2pr JB Weld Original: amzn.to/31lCDIg JB KwikWeld: amzn.to/3j2qWMz JB Weld Extreme Heat: amzn.to/2Emz5fH Devcon: amzn.to/2QfKbWm Loctite: amzn.to/3giAPE9

As far as I'm concerned this is one of the two or three most useful channels on RU-vid. Consistently useful information, good tests, total transparency. You test, and then I take advantage of your tests when I purchase.

I just did a quick check, JB weld original tensile strength 3950psi, devcon 2500psi, other quick setting epoxies ~ 1500psi, so your tests are spot on. You showed what these numbers mean in real life situations, great video, thanks!

Speaking as an engineer, your videos are consistently the best thought out and executed tests I've seen on youtube. I also appreciate the straight forward delivery without all the forced-over-the-top-personality injections so common.

Thanks. 5 years later...and your video is still helping people.

I bought a boat with a cracked block, I just drilled the ends of the crack and ground the surronding areas to bare metal and smuckered on some JB-Weld, 6 years later still not a single issue with the repair. JB-Weld gets my vote

One of the most scientific, honest, down to earth, unbiased product testers on the youtube universe, period. Trust this guy.

Protip for mixing epoxy that i discovered this week: 1) put it in some clingwrap 2) twist the clingwrap into a bag 3) massage it around to mix 4) cut a hole to squirt out the mixed epoxy Its cheap, disposable, easy cleanup, and its a built in dispenser!

You legitimately deserve ALL the likes simply for being a genuinely good guy. There are countless people who have such a great appreciation for what your doing and your just doing it just because it's the right thing. Yeah man, I'll like every video and watch every add considering it is the absolute least I could do to show said appreciation. People like you give me hope for the future.

I'll add some more: I was a race bike mechanics and I've built many engines back in the days where 2 stroke reigned the streets and tracks. We could not trust Devcon for internal modifications as it can't withstands heat and fuel/oil mix in two stroke engines. We usually stuffed the crankcase and the crankshaft pocket with JB weld to increase primary compression ratio. Also streamlined the transfer ports, intake, and the carburetor with it too. JB weld will sticks and keep the ported shape for years while Devcon simply "swell" (increase the volume), turned brown, and oftentimes... found in the exhaust pipe's chamber.

This is what I call quality content. I can tell you're one of those guys that holds themselves to a higher standard. Amazing work.

I’m always so impressed at how much time and planning goes into this. You’re so careful and methodical. I really admire that.

This is exactly what I needed for a project I have in mind! Thank you for putting this together! It's surely saved me hours of time and trouble and who knows how many dollars?! I appreciate your thorough yet no-nonsense approach. Very informative, clear, and well-presented!

Back in 1992, my ex brother in law bought a 1987 Yamaha YZ-80 for $400. The oil crankcase was busted/cracked. The owner was asking $800, but after not selling it for 4 months, he took my BIL's offer of $400. It had a 3 way "Y" crack with a section broke out in the crack. My BIL cleaned everything with gas first, mineral spirits, then alcohol. After he JBW'ed it, he let it dry for 36 hours (just to make sure). That motorcycle is still running today, with that same JBW crack repair. The engine has been rebuilt twice, but the JBW has not failed......yet!

It's amazing to see how absolutely consistent and informative your channel has remained, but also how much you have improved. Your presentation, recording quality, energy, and more have only gotten better!

Since finding your channel, I now review your video tests before I buy products for my home use. Your tests are very fair, transparent, and well explained. The videos move along at a quick pace and are entertaining to watch. Keep up the good work - love your channel!

Well done. I appreciate your adherence to good scientific technique and the excellence of your photography. It is also noteworthy how well spoken you are.

I love how detailed he is who agrees ? I love all your videos keep it up!

Some comments on epoxy adhesives in general. For consumer use manufacturers are really limited on the type of chemistry they use primarily for liability reasons. Most are based on what they call "Bisphenol" resin and "Polyamide" curing agents. Those are your standard work life products. The fast cure products either use a "mercaptan" curative or an aliphatic amine. The issue with fast cure is just that , no properties except for fast curing. The only other variable is "filler", the mineral powder or metallic powder used as reinforcement or for shrinkage control. There are also couplers such as silane so and/or wetting agents that lower the surface tension of the adhesive and allow it to wet the substrate better. I really like the original JB Weld. I suspect it's a Bis-F resin with a Versamid curing agent and AEP accelerator. Probably has some silane in it and the filler looks like black iron oxide. That filler will reduce shrinkage and can transmit heat pretty quickly giving the adhesive better overall heat resistance. The extreme heat version, as a guess, has a higher % of iron oxide so it doesn't wet as well and hence doesn't bond as well. The cross-linked bisphenol type epoxy heat resistance is about 250F long term and 300F intermittent. Fillers help but I wouldn't count on epoxy above 300F and at 350 the polymer degradation happens pretty quickly. Don't want to appear like Cliff Klaven but I formulated epoxy adhesives for more years than I want to remember!

I really like how you labeled everything, mixed everything, and displayed everything. This IMO, is a real world test. Great demonstration.

Thanks for showing metric unit too, imperial units are hard to grasp sometimes!

"None of these should fail at 5 inch pounds." [JB Weld Extreme Heat then fails at 5 inch pounds]

This is my new favorite channel. All of your test seem to be really scientific and consistent. It looks like you put a lot of hard work into it. So it greatly appreciated. I've been telling my friends about it.

Thanks for all the hard work you put forth to keep the masses informed. I really enjoy watching your videos. They are precise, to the point and never boring.

I didn't think there was that much difference in Epoxies, appears i was very wrong.. Thx for the education.

I would like to see a test where you drill a 1/2" hole, completely fill each hole with each type of epoxy then drill and tap a smaller thread (say, 5/16" or 3/8") then test it to see how much torque each epoxy is able to withstand before failing. THAT would be interesting.

Another great video, thanks to you I'll just keep buying J-B Weld original

Thank you for all the tests, you certainly cover all the basics. I used Delco Remy epoxy, and later JB weld to repair broken crankcases on a few motorcycles, back in the 70's, 80's. Also plastic and other repairs. Both having flexibility in varying temperatures, pressures, oil, vibration. I love all your stuff, people can save a lot of time, money, and frustration with the knowledge provided in your great videos.

I recon your video's are the most thoughtful out of all the test/comparison videos with the added bonus of being enjoyable to watch and appreciate the time and effort put into making them. Thank you.

I loved the video and u just saved me some money keep up the good work and have a great day

Awesome! Suggestion: In the table at the end, highlight in yellow the winner in each category. You did this for an earlier super glue test and it was *very* helpful. Thanks again, I watch your videos all the time.

I don't buy ANYTHING until I watch your video on it..(if there is one). Be it paint, oil, spray paint, geese, engine additive, tools, power tools, ANYTHING!! I can not thank you enough for all you have done for me over the years!! I am very grateful to you sir! 😀 Best channel on RU-vid!!

Thanks again. I realize that this video was produced almost three years ago but I just came across it now. I have got to give you credit on the innovation you apply in devising tests. Yes, your subscribers may suggest the “what to test” but you put together the “how to test” part. Serious thinking goes into this in my opinion. Then, that must be followed by faithful and consistent execution. And then more serious thinking again about the interpretation of the results and what they mean. I also appreciate your speaking pace and staying on topic. Video editing is superb, I never feel like you are wasting my time; you show everything that is relevant while editing out the content that does not add any value. Great work… Have you ever considered publishing a collection of your findings? This could be a nice add on to the channel. Publish a .pdf document for a nominal fee. I realize this might detract slightly from views but the information you report is perishable to some degree as (better/stronger/faster) are always coming out and things will change. Perhaps you could publish once per year and update with new content annually for the next edition.

When in doubt JB weld it out

dude THIS is educational awesome video!!!

You do an awesome job with your reviews. When I'm looking for the best of a product to purchase I check out your channel to see if you've reviewed it. No one else comes close to the in depth product tests that you do. Please keep up the great work!! Thank you!

Love this channel . Saves time, 💰 and frustration when he tells you what's a good product. Tests everything better than anyone. Thank you sir.

Excellent testing... Load bearing test, torque test and impact test... this should cover almost all scenarios of usage and give a good idea of what compound to use.

Hey man. I really appreciate the time you take out of your day to display real testing on these things. Save me ALOT of time, money, headaches, wondering/worrying if this time will it work, and repetitive work. Thank you SO much. I'm a subscriber for life. GREAT JOB!!!!👍👍👍👍👍

I've had VERY GOOD results preparing surfaces with my small sandblaster. Sand blasted surfaces plus JB Weld original has always proved to be an EXCELLENT joining method for various metals

Have you considered a penetrating oil test? I have found two online, but they have limited sample sizes. Why not get 200 uncoated 3/8 nuts and bolts, thread them together, soak them in a bucket of corrosive solution for a month, then measure the torque to loosen with 5 samples for each penetrating oil, and 5 unoiled. Also would be interesting to see if there is a difference between 5min soak time and 24 hour soak time for the oil. Penetrating oils to try PB Blaster, liquid wrench, wd40, 50/50 ATF/acetone, kroil, whatever is on the shelf at the parts store.

I’ve definitely used 5/6 of these and always wondered about a controlled test like this. Saving a lot of people a lot of time and money. Thanks a lot man

This is probably the first time or at the least one of the first time I have ever commented on a youtube video . I think you do a great job at all your test and do your best not to have or show bias to anything or anyone . Thank you very much for your effort and diligence in all you do.

Great video! Really interesting to see how they actually perform in the field. Always very difficult to know what to choose at the counter for a particular application. Thanks for all your efforts!

Totally worth it! Your viewers are the clear winners. I'm really glad you kept making videos because I just found your channel xo

I am a knife maker so shear strength and adhesion to multiple materials are my main criteria. I should say that many materials shrink or expand with heat and moisture so... again adhesion and shear are my big requirements. I have used many epoxies in my 40 years of making knives and have settled in T-88. I know many makers who use some of the products you have tested here but for me... longevity of my handles is super critical. T-88 has not failed me in over 15 years. Give it a try.

Watching some PF classics, the channel sure has come a long way. If this video was done today I see the process being much different. Still a good and entertaining video.

Five years since you've posted this video, and I'm suddenly grateful for it. I need a strong epoxy to bond metal together. Keep up the great work! Your experiments are unmatched.

I'm so happy this popped up in my news feed. I've been stuck in "paralysis through analysis" on a snow blower paddle mod forever. I need to attach paddles made of D.O.T. mudflap to the steel auger on my snow blower. I don't have room to use self tapping screws like most people do. I've been befuddled trying to choose an epoxy. We just got a foot of snow in Denver and I still have my machine taken apart. It looks like the J.B. Weld original is the one for the job. I'm new to your channel. thanks for making this video. It just might lift me out of a rut. (literally)

Out working in the yard, cut my finger pretty good, mad at the whole world! Put a bandaid on it, so pissed I can’t think strait! Take a break, turn on your show. Suddenly everything is better! I’m calm, happy and focused! Cause I need to know! Which epoxy is the STRONGEST! God I love your channel! Thank you!

Actually, I consider this a huge win for JB Weld Original.

This is by far the most interesting and useful content on the net. Keep up the hard and honest work!!

Thank you for all your hard work my friend. I’ve watched most if not all your videos and not one time have I thought “I wish he would’ve done that different”. You approach your task from every angle. Great work!

Watching even older content and still great! the effort its worth to mention and a really god job! You really help us all! Have a good day! Thanks for the vids!

I personally have had good luck with Blue Magic QuikSteel epoxy putty. You find it at the auto parts stores. Sets fast, bonds well, is chemical resistant(unlike jbweld), and heat resistant up to 500°F.

We really appreciate the time it took you to provide so much detail. I love that these tests provided unbiased "real world" results. Thank you so much!

You put in a lot of hard work and you're very meticulous in what you do, GREAT JOB, thanks for these videos. You need your own TV show!

My experiences with any "epoxy" have been to drill holes in both surfaces to be joined, and push the epoxy into the holes, so it anchors to the part, and itself, really "gripping" the part. JB Weld Original has always been in my tool box. Great video, once again!

My gosh, you've got some great content. There goes my whole darn day! I can't stop watching your vids? Why? Because they are so well done and so useful and answer so many questions I've had for so many years! A huge thanks!

Been using JB Weld orig for forever. Duct tape, velcro and JB Weld, 3 of the most useful things I've ever owned.

"as you can see I got 2 nuts here"

Try Metal Set. Available from industrial supplies. Great tests, great editing, great information. I like JB original.

Fantastic video as always! Your tests are so thorough I feel really informed as to which products to use in the future. Thanks again!

I have used Davcon for eons. Range from high pressure , high volume water pumps , to thermostat housings and even block and cylinder head repairs. The parent metal always continues to erode or corroded, but where the davcon is, it’s like the day I mixed it up and spread in on surfaces. We have a high pressure pump housing with a 1 1/2” hole in it. Filled it up with davcon and it withstood 2200 PSI at 205l a minute for another 5 years. It’s simply brilliant.

I for one, love what you do and as a workshop/mechanics/science enthusiast I do appreciate the quality of your production. I even began to perform tests like this myself for the stuff i build/use. So yeah! keep it coming man! It´s just sad that some of the products you test, are not available here, like these epoxies. Yet, from now on i will buy 24hours epoxi since there´s a hell of a difference!

Thanks for taking the time and resources to do this. Helped me in making my choice of epoxy selection.

You should look into some of the West Systems epoxies; their products are used in both professional manufacturing and hobbiests. Would be interesting to see how their 105 series (straight and with adhesive fillers) varies with the type of hardener as well as their G-flex and Six10 products. I use West Systems for the carbon parts that I build and think it would beat all of these hands down!

7 years later, and I know I can still trust you to help me make a decision once again. Thank you for all these videos you make.

As a gunsmith I use several different epoxies in my craft. One that I use the most is a gunsmithing specific called AccraGlas which is sold with a black powder used to thicken it to the desired consistency. When using it to bed a barrel and action to the stock it must be used with a release agent. If not, the only way to remove the barreled action is with a hatchet. When properly used it contributes significantly to the accuracy of the rifle. Acraglas is also excellent when used a a grain filler when finishing the stock. Your video was excellent and quite an eye opener. Please keep up the good work and I will look forward to more of your videos.

I appreciate the time and effort.This shows what I have found in my attempts with epoxy…JB weld the original has always (given I prepped the material)proven to be the best for me.

Need a press to see how they do under compression, and perhaps a straight pulling out test. Qualities of each may still fit different applications.

Even 5 years after posting, still a very useful video. I love watching your videos and always reference them when making decisions. Fantastic work, thank you for doing it.

Good job. As consumers we have an honest look at these products that we otherwise wouldnt have had.

I'm sitting here watching and suddenly realize I'm fascinated with watching him mix glue...

Harbor Freight would have been an interesting one to test. Currently $1.79 for the quick setting version. (Edit: meaning compare with price as a parameter)

Project Farm: One of the most trusted , respected and informative channels on RU-vid. Period.

You and your processes are wonderful! Can't thank you enough for your testing. I"m subscribed and really look forward to your videos!

JB Weld has a very distinctive smell that says "Yes, I'm doing something janky. Don't Judge me."

AFAIK, JB generally markets the Extreme Heat as just a filler, not an adhesive. Maybe the best choice for repairing a head crack, but not so much for gluing in the spark plug. It's worth noting, though, that fully cured regular JB Weld is rated up to 550F, so it's really down to whether you need the extra heat resistance beyond that more than the adhesive properties.

jb weld makes a putty that you mix to activate called steel stick try that one

Ahh I was looking for this, good information. I'll steer away from the quick epoxies unless I absolutely need the speed over adhesion.

Now i`m really curious to replicate your test with some epoxies that are available here in Russia and compare results. Can you specify head size of those bolts and distance from steel surface to chain?

@Project Farm, You are the #1 Channel on all of RU-vid, and you are definitely my GO TO CHANNEL whenever I am getting ready to do any repairs... I am a Widow with a limited income and you save me so much money doing these Test, THANKS TO YOU I no longer waste money on useless products... YOU ARE TRULY A BLESSING🙏 Thank You 👏👏👏

Very nice test! Learned a lot! JB Weld Original seems to be a very good all around product to use on steel stuff. Thx for the vid, very good! Double thumbs up.

Great video. I'd like to see it done a 2nd time on a new piece of metal and in a different order to see if you get the same results. Valid results are repeatable!

Awesome video! I'm always amazed, you deserve alot more subscribers!

OUTSTANDING video!!! 1. Quick description of test. 2. Conduct the test. 3. Explain the results. That is the recipe for a great video! I can't stand other reviewers who waste time explaining things that have nothing to do with the test. For example, there are others who would have spent a half hour explaining the history of the torque wrench. That story is interesting, but it has nothing to do with the test. Keep up the good work!

I like project farm because he actually uses recommendations in the comments I swear this isn’t for school

I would be very interested to see how important the correct ratio is. Say 50/50 mix of the epoxy vs 40/60 etc

In summary, these companies are selling products with ludicrous strength ratings of 2,000+ lbs, and they can't withstand the load of a 25 lb weight. Lol.

I've only just started watching your channel. About 4 months. I have to say, I will not buy anything without first seeing if you have tested it. I've recommended your channel to about a dozen people so far.

I've noticed one issue with the test, maybe someone already mentioned it. The one variable you didn't account for was the volume of epoxy being used, for a conclusive test, the amount of epoxy being used must be exactly (or as close as you can) the same between each product. Love the concept of comparing commonly used products that can be found at any local convenience store. Gj

Keep up the good work. Your product testing helps me know what to stay away from. Which product I should choose is still a $ factor. On the epoxy thing, I have wondered about what the results would be if I played with the mixture ratio. Or choose items I would never want to glue to each other. Maybe I would have more time for such experiments if I just stopped watching RU-vid videos.

Great video! My experience has been that the mixing ratio of Part A and Part B is pretty sensitive. The other factor is mixing time. I think it would be interesting to see if you chose a few epoxies and tried seeing how crucial the 50/50 ratio (or whatever the direction call for) is to getting strength. Again, love your well thought out experiments!

I can tell this was an early competition video by how much more polished and information packed the new ones are. It really is not apparent how you should make the video until you do it.

Love these tests and reviews. They are really helpful in making purchasing decisions based upon whatever my specific needs may be at the time and what I can afford. Thanks so much for sharing. 😎👌🏼

Fantastic and very thorough test. Thank you for doing this! Immensely helpful.

Maybe duck tape vs flex seal tape (from tv) vs fiber fix tape.

Great video . I have used JB quick on pitted aluminum intake manifolds and also cylinder heads and it worked well for an extended period of time . General Motors used Devcon in a recall on Oldsmobile aluminum intake manifolds and it too held up very well . I typically resurfaced cylinder heads but when the customer had budget issues , JB was the go to .

I'm a huge fan of your videos, and rigorous testing methodology; I know this is an older video, but I would very much like to see a test of high temperature epoxies. I've seen epoxies that claim they can withstand up to like 1000 degrees; but I really wonder how valid those claims are. either way, thanks again for all your diligent work, and keep turning out great content.