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Old 05-07-2011, 09:55 AM   #1
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Talking JB Weld ??

Hi all,

Our MH has a leak that I'm thinking of fixing with JB Weld "waterweld", and I thought it would be nice to hear some other folks opinions.

The leak is with the black tank flush system. Clear water is leaking, not the dirty stuff. On top of the tank is a elbow with a hose attached to the elbow. The hose snakes its way to the passenger side and connects to the inlet for a hose to flush the tank. When I attached a hose to flush it started leaking. A gentle push on the hose stopped the leak to a trickle. Light pressure would stop the leak all together, so there's very little back pressure. I know what the proper way would be with a new pex compression fitting, but because it's not under a lot of pressure, I think some sort of cold weld compound will work fine. I posted the same question on another forum and got some good answers, I thought I'd do the same here and see what you fine folks opinions are.

THANKS in advance for your thoughts, ideas, suggestions.
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Old 05-07-2011, 10:15 AM   #2
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POR has a fantastic compound. It saved me about 3K when the oil pan started leaking on one of the engines in my boat.
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Old 05-07-2011, 05:47 PM   #3
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Wolfpack Fan,

JB Waterweld saved me about $40 for the vacuum breaker on the toilet. The stuff is fantastic, especially if there's very little pressure. The only problem would be trying to weld polyethylene, which is what PEX tubing is made from, but I don't know about the fittings - some are metal.

In your case, you have very little to loose except $5 or $6 for the JB Weld. You have low back pressure, the water hose isn't connected all the time, and you can see where it's leaking, which means nothing is going to get flooded. If it doesn't hold, then replace the fitting.
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Old 05-07-2011, 08:11 PM   #4
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Is the fitting ABS plastic or PVC? ABS can be welded, which often needs nothing more than a soldering iron. Or there is a special ABS cement for it.

There are also PVC plumbing repair epoxys. I would use that rather than JB.

How to Stop a Leak in PVC | eHow.com
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Old 05-08-2011, 12:25 PM   #5
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Gary makes a good point. What do you do if the JBWeld doesn't hold? How do you remove it so something else may be used?
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Old 05-09-2011, 09:10 AM   #6
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If it's where you can wrap it.. Rescue tape (Streatchy silicon tape) or even good vinyl electrical tape.. GOOP is another good product but don't know how well it sticks to PEX. JB-Weld is a bit much for this task.

Make sure it's very dry before fixing.

Finally... Given the pressure.. You might try a straight barbed fitting and a copule of standard hose clamps.
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Old 05-09-2011, 09:46 AM   #7
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Seems to me that if you know the proper way to repair it, that is how you should do it!
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Old 05-09-2011, 09:54 AM   #8
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Quote:
Originally Posted by Luckiest Dre View Post
Seems to me that if you know the proper way to repair it, that is how you should do it!

Agreed,

But sometimes you need ta just Git R Dun!

Growing up on a farm, I learned early, how to get the equipment up and running....Sometimes ya gitRdun, then fix it proper when when the job is done. (as long as safety is not compromised)
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Old 05-09-2011, 10:10 AM   #9
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academy sports sell some 3M products that can be repaired under water if it was me go with jb weld quick
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Old 05-09-2011, 11:26 AM   #10
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Great ideas folks! Thanks to all of you. I ordered some JB waterweld from ebay.

We'll see how it works on a test part before applying it to the fitting.
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Old 05-09-2011, 12:37 PM   #11
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But sometimes you need ta just Git R Dun!
x2
A few years back I discovered cracks in my Black water tank around the dump valve that were just starting to leak... Yuck..! I posted a call for help on a couple of RV forums. I received similar responses, everything from replace the tank to weld it to seal it. Lots of opinions, lots of prior experience... lots of back and forth.

I cleaned the area around the cracks, used sandpaper to roughen the area and spread two tubes of JB weld around the cracks. It's been 3 years now, no leaks, no additional cracks... I'm a full-timer so it gets lots of use.

Good luck with your project, hope it works for ya.
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Old 05-10-2011, 07:20 AM   #12
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Originally Posted by Liveneasy View Post
x2
A few years back I discovered cracks in my Black water tank around the dump valve that were just starting to leak... Yuck..! I posted a call for help on a couple of RV forums. I received similar responses, everything from replace the tank to weld it to seal it. Lots of opinions, lots of prior experience... lots of back and forth.

I cleaned the area around the cracks, used sandpaper to roughen the area and spread two tubes of JB weld around the cracks. It's been 3 years now, no leaks, no additional cracks... I'm a full-timer so it gets lots of use.

Good luck with your project, hope it works for ya.
Sounds like you did it right. I think probably the most important part of any repair like that, is surface preperation. I won't be able to sand the piece, because it's an elbow, but I figure a good stiff brush and some alcohol ought to get it clean enough for good adhesion for the JB Water Weld. Thanks again friend.
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Old 06-13-2011, 04:43 AM   #13
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I don't know about the JB water weld but I repaired a damaged motorcycle engine side case with standard JB weld and it's still holding 8 years later on my buddy's old bike and another friend of mine fixed an engine block that threw a rod out the side of the block on an old 40's Ford tractor and it's still running 15 years later. I'm a firm believer in fixing things properly the first time.................but the few experiences I've had with JB weld have been amazing!
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Old 06-13-2011, 12:30 PM   #14
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I like GOOP and if it don't work you can peel it off. I got a old water hose that I use around the house that got a leak. Used some electrical tape and GOOP and it fixed. I have also used JD Weld with good results. Just don't think JD Weld will be easy to remove if you ever have to take it apart.
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