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Old 06-02-2016, 12:23 PM   #1
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Patching a crack in bottom of a grey water tank

I have a 2008 Puma 26RLSS TT with two grey water tanks. The galley tank developed a 6" crack in the bottom last fall, which I fixed with epoxy and Gorilla/duct tape. We have only used it with the drain valve open and continually draining the tank in the meantime. So, it has not been tested with the full weight of 35 gallons on the road for any distance. We have an event coming up later this month that will require some dry camping and hauling waste water to a facility several miles away. I am wondering if I should get my tank replaced, professionally patched, or reexamine my fix from last year and redo using some other plan than the epoxy/duct tape effort of last fall. Any thoughts out there from better DIY types would be appreciated.
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Old 06-02-2016, 12:31 PM   #2
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Plasti-Mend!!!!!!!!

Id try plasti-mend. A lot of people have used it for tank repair with great success. I have used it on previous SOB TT and it worked great. I followed the instruction to the letter for an 8 inch crack and it worked perfectly. Never has a problem in the rest of the 2.5 years I owned that TT.
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Old 06-02-2016, 12:50 PM   #3
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A lot of it depends on what the tank is made of. From my experience Forest River brands typically use a lot of MDPE tanks and if that's the case you can forget about epoxy , glue, adhesives, etc. Nothing will stick to one of those polyethylene tanks long-term. The way to fix those is to replace it or get a plastic welder. On the other hand if the tank is abs and the crack is in a flat area you can get a piece of the material in sheet form and solvent weld it over the crack. If it's located in a curved area or close to fittings then it becomes problematic and a lot tougher to patch.
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Old 06-02-2016, 01:06 PM   #4
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Correct if it is ABS then plasti mend, if not do not use plasti mend
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Old 06-02-2016, 01:44 PM   #5
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Patching a crack in bottom of a grey water tank

Great. Plasti-Mend if it is ABS, but not if it is MDPE/polyethylene. I had never heard of Plasti-mend. Googled it; now I know where to get it. One question: How do I tell teh difference between ABS and MDPE/polyethylene? Is that something I can do, or do I need to contact Forest River and ask? Appreciate the help. Really!
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Old 06-02-2016, 02:02 PM   #6
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What I did for mine was take a paper towel and put a little acetone on it and slightly rub the tank where my crack was. I was told if it is ABS the acetone will react to the ABS and the ABS will break down and stick to the towel while the MDPE tanks wont. Mine did this and that is how I knew. I got this info off a different forum but it worked for me. For verification you can email the factory and ask.
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Old 06-02-2016, 02:07 PM   #7
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Patching a crack in bottom of a grey water tank

Acetone test. Got it. Thanks. I'll give that a go tomorrow when I go over to my storage facility. I'll post how it turns out. In the meantime I'll try to find a way to contact the factory and see what Forest River has to say, too. Can't thank you enough.
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Old 06-03-2016, 12:43 PM   #8
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Patching a crack in bottom of a grey water tank

Good news, guys! The acetone soaked shop towel did stick to tank and became gummy. Sounds like ABS to me, so I will order the Plasti-mend latter today, do the repair and report results in a couple of weeks. Thanks, loads.
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Old 06-03-2016, 01:03 PM   #9
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Thats exactly what mine did. Glad to hear! Good luck with the patch job. plasti mend is easy to work with and the company ships fast, at least when I ordered they did.
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Old 06-03-2016, 06:51 PM   #10
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Could you post some photos of your tank crack and DIY repair? That'll help myself and others who might have similar issues.
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