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Old 10-10-2008, 09:17 AM   #1
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Long story short- We cut a hole 1'x1' in our holding tank.is there a good way to patch it?
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Old 10-10-2008, 09:17 AM   #2
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Long story short- We cut a hole 1'x1' in our holding tank.is there a good way to patch it?
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Old 10-10-2008, 10:11 AM   #3
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There are places that do plastic "welding", and you can even buy DIY welding kits, but I've never done it. There have been a few reports on this forum that Eternabond tape works very well on patches & cracks in these plastic tanks.

good luck. (ps -why did ya cut a big hole like that?)
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Old 10-11-2008, 09:30 AM   #4
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Had a fuel pump go bad and mechanic thought it would be easier to cut thru the bedroon floor to the gas tank instead of taking 50 gallons out of tank. Also the hydrolic jacks had a brace around the gas tank.would have to take jacks and brace off the gas tank to lower gas tank.we wish we would have done it the correct way but we got the fuel pump fixed.
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Old 10-11-2008, 04:02 PM   #5
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Check with any rv dealer parts dept. They have repair kits to patch the tanks. If it is too big of a hole they should be able to give you advice. Doug in Mesa AZ.
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Old 10-12-2008, 12:00 AM   #6
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If you find that patching is unsuccessful; body shops have plastic welders and could weld a plate over the whole. How mmuch room do you have to work with?
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Old 10-12-2008, 12:51 PM   #7
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We had a crack on the bottom of our black tank where the outlet tube was. I can tell you that eternabond will not hold very long with pressure pushing out against it. I ended up replacing the tank. Wish I could have offered happier news, but spent too long trying to fix it before replacing. I did use eternabond on the top of a freshwater tank with good luck, just never over-filled it again. HarveyP
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Old 10-12-2008, 04:09 PM   #8
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How about trying Mighty Putty? Go here for information.
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Old 10-13-2008, 12:03 PM   #9
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RV waste tanks are made of a special molded plastic so they can't be repaired with the adhesives used for PVC or ABS plumbing fixtures. However, www.pplmotorhomes.com sells a holding tank repair kit for around $40 plus shipping. I believe it uses an epoxy-based adhesive and a polyethelene patch. Might do the trick. I would also contact the service department at one of the larger RV dealers to see if they have any suggestions. Best of luck.

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Old 10-13-2008, 04:06 PM   #10
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Thanks for the input.We will try epoxy and 1" overlap of same plastic then screw it about 1-2 inches since the hole is on the top of the tank we hope this works. If not- taking it to RV place
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Old 10-13-2008, 05:49 PM   #11
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Black tanks are usually ABS plastic (you need glue that is made for ABS plastic, available in the plumbing glues sections). The translucent white tanks are often polyethelene. I've never had much luck with getting those repaired.
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