J-B Weld WaterWeld

I refurbish and repurpose cast iron cookware and pretty much anything that's cast iron because it's my passion. When my boss who owns a barn in Connecticut that was built in the 1700's found this out, he immediately thought it would be a fun challenge to start digging up old cast iron pots that he would find in the ground in his barn to bring to me to see what I could do to bring them back to life. The first project he gave me was an antique S&P Kettle pot. It was severely cracked on the bottom. When it comes to cast iron, you have to weigh your options and in this case it really wasn't worth having somebody weld it together for me because it could have created more damage because the crack was that severe. I felt because this wasn't going to be used for cooking and a great repurposing project, I consulted with my service managers because they work with these kind of materials and would know what kind of bonding agents in materials would be best to use that would be effective to do the job for these kind of projects. Because my job involves working with plumbing and cast iron and things of that nature, I knew that I was talking to probably some of the best resources. They recommended this product and I purchased two tubes from Amazon because I wasn't sure exactly how much of this stuff I was going to or needed to use. Sometimes it's always hard to tell from the picture on Amazon as opposed to what you get when you actually receive it in the mail. It is a putty type material and it is white. I only used one tube and not even close to half of it so a little goes a very long way! The putty works perfectly and it goes within the crevices that you needed to and you can shape it but you have to make sure you do it quickly before it dries because it does dry quickly as well which is great. I didn't want it to be perfect I shaved it enough to fill in the huge crack. Because it's white I knew I didn't have to make it look pretty because I knew I was going to be repainting the whole pot once the putty had dried. Before I did any painting, I did a test just to humor myself and I filled the pot with water. I have to say that no water left that pot anywhere and if I wanted to use the pot for just a planter at this point, I am incredibly confident that I could do that without any worries of leakage. So I have plenty of this left for the next time I come across a crackpot repurposing project and I'm excited with the fact that I have a product that is amazing and will definitely be able to use and it will work. So whether you're going to use this for plumbing needs, repurposing needs or whatever, not only is the price right, but this stuff is awesome. It does the job. Again though just to be clear, it is white and dries white so if Aesthetics are an issue for you, you should count on definitely painting over it with the color that matches the item that you're working on.

First off i do like the product, it seems to work and hold strong. I used it to cement/glue some rocks and wood together in my aquairum. After finishing it seems well put together to where i trust it with fish in the tank. But It was hard to get it to stay on the rock as it didnt want to get off my gloves that i used to apply it. That was the most difficult thing about the process and it easily stains objects like rocks, wood and potentially glass if you accidentally get it on them. I add to use some glue to add moss on the spots i used it and accidentally touched to hide it as it itself and its residue are noticeable.

Normally this stuff works well and sticks to most anything. Did not work on my Fiberglass water tank the developed a leak. Sanded the spot. Cleaned with MEK.. applied JBWeld and 24 hours later filled the tank and the leak re appeared.

Didn’t believe this stuff was as good as JB Weld says. I was wrong I had a broken faucet in my RV because of it freezing. I applied this to the faucet and it worked holding water pressure in with no leaks at 50psi. Must have in your RV for quick repairs

I was desperate. I live in an old house with old pipes. One had burst open at a joint and I could not get it to stop spewing water. I was told it would be the next day when the plumber could come out. So I tried wrapping it with waterproof tape and I made an order for the weld. Having gotten it I tried my best to apply it to the pipe, over the wrap, and any other open place I could put it. I finally got it down to a drip. Now here's the thing, when the plumber did get here he tried everything he could to remove that mess that I had made. He finally had to saw off that piece of the pipe and replace it. He shook his head at me and told me there was no way that piece of pipe was going to be uncovered. Whatever I had put on it had solidified and was not coming off. So here's my thought, had I been able to get the pipe dry and apply it as per instructions it would have held. I just had a problem would not being able to find the shut-off. So I had the plumber show it to me before he left, not knowing that having done that he may have just knocked himself out of that next call! LOL

Purchased this to try to seal off a leaking PVC joint (1.5" ) on the return side of my pool equipment. I had low hopes as I've also tried a different brand of two part epoxy, but with the good reviews, thought maybe this was a superior product. After kneading it together, I applied it to the joint, completely surrounding the circumference of the joint and firmly pressing it in. Note that the joint (outside) was dry at the time. I let it cure for about 8 hrs (PHX, temp between 60-80 F during that time), and it was pretty thick as I used the entire tube, and was more of a brighter white (than off white). I pressed on the epoxy and it was "crusty" but still a bit pliable as I could push on the thicker parts. Once I turned the pump back on, the epoxy had not bonded to the PVC, and so the leak was not stopped. What is even worse was once the epoxy was damp again, it began to soften up even more and had no adhesion to the PVC anymore. Literally, I peeled it off like it was a casted mold. I can't imagine trying to get this product to set while under water. Maybe this is not specific to this brand and this product would work better on a different material, but on PVC piping, it was a complete waste of money.

The day before a week-long trip, my wife tells me the kitchen sink is clogged. Not what I want to hear at 10pm the night before I have to wake up at 4:30am for an early flight. So after using the plunger and then the snake, I finally clear the grease clog enough that I can go to sleep at 1:30am. I get home a week later and I try out the kitchen sink by washing some dishes as a test. Great! The water went down. Then I step out to the garage (where the waste line runs through) and find rivers of water trickling all over the floor. After moving the washer and dryer out of the way and knocking out a foot of concrete around the waste line, I find water pouring out of the galvanized pipe through a corrosion hole. Apparently, the hole was being covered by the built up greasy sludge and the snake moved the sludge out of the way, allowing all the water to run down the concrete block wall. As I was contemplated popping a new hole though the wall and into the kitchen cabinet so I could run a temp PVC line (I am redoing the kitchen soon anyway), I realized I had bought this J-B WaterWeld Epoxy some time ago "just in case". So I thought "what the heck" and tried it out. Worst case, I would have to run that new line anyway. Well, s---fire if it didn't stick to that galvanized pipe and seal that hole! Even though it was still dripping water, that patch stuck and cured in place just like the packaging says. I had to use a second patch because it was still leaking from somewhere I couldn't see and that second patch sealed the deal. Now, I am treating the line with some Green Gobbler Enzyme to keep the sludge at bay until I replace everything in the kitchen reno. A couple of tips: 1. Clean the area first with a degreaser, as the packaging says. This was essential to me because all sorts of cooking oils had been coming out of that hole and you need that stuff to stick. 2. Use a knife to cut only what you need and mix it in your hand using a glove. That stuff is very sticky and won't easily come off your fingers. 3. If patching a hole, form a patty after you mix it and apply and them smooth the sides of the patch. It will mostly retain it's form and get rock hard in a few minutes. 4. Finally, don't wait too long to apply. You have a few minutes to apply it, otherwise the chemical reaction will start to harden it and it won't stick. I am so glad that I had this stuff on hand. It saved me a full day of breaking concrete block and fitting a new temp waste line. You can see the patch at the bottom of the pipe. Because of the location, it had to be done by feel and I did take off the glove. But it wasn't so bad after it had been mixed. Update 8/23/22: After 6 months the patch is still holding strong with no leaks. That's a relief considering the kitchen reno is taking longer to get started than expected. But that's another story...

Used this on a very slow leak on pvc. Didn’t stop the leak but can’t say that it might not work on other applications.