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Old 06-02-2016, 11:23 AM   #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, 11:31 AM   #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, 11:50 AM   #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, 12:06 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, 12:44 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, 01:02 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, 01:07 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, 11:43 AM   #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, 12:03 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, 05:51 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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Old 06-03-2016, 10:15 PM   #11
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Patching a crack in bottom of a grey water tank

I sure will take pictures. I ordered my Plasti-Mend kit today from the factory. I suspect it will be about a week or two before I get to doing the repairs, but I will come back and post the pictures. I'll have to figure out how to post pics on this forum. Haven't done that before here. Use photobucket on boat forum. Any tips?
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Old 06-04-2016, 08:30 AM   #12
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I believe you need Photobucket (that's what I've been using) or other 3rd-party hosting site to put photos up here too.
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Old 06-04-2016, 10:18 AM   #13
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Patching a crack in bottom of a grey water tank

It may be 1-2 weeks before I get my Plasti-Mend and get the job done, but I certainly will post pictures. Since I have not posted pics to this sight before, I will practice and try to post the pic I took of the label on my tank. I thought I might need to contact the maker, so I took this pic. More to follow when I have completed the work.
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Old 06-06-2016, 09:31 PM   #14
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Patching a crack in bottom of a grey water tank

Status report: Plasti-Mend product has been shipped, and I sent an email to the Travel Star Product company to confirm that the tank is made with ABS and not MDPE/polyethylene.
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Old 06-08-2016, 08:03 PM   #15
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Excellent glad to hear it.
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Old 06-13-2016, 10:13 AM   #16
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Unhappy Patching a crack in bottom of a grey water tank

I talked to Tony at Travel Star Products today, and he confirmed that my tank is ABS. So far so good. I will undertake the repairs in the next few days, hopefully. Things here in Orlando are distressing today, to say the least. The telephone number for Travel Star Products is 574-533-0447 should anyone else ever need to know that.
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Old 06-20-2016, 10:19 PM   #17
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ABS, Acetone.

in our previous camper, we had a major leak in our black ABS tank. there was a circular crack all around the threaded drain donut.

I took it off the camper, cleaned it.

I took a sandwich sized ziplock container.

I then got ABS pellets (looks like someone placed an ABS pipe in the blender). I got a full brown bag (way more than I needed) from my local RV parts dealer for 5$.

I used a metal paint/plaster flexible putty knife to mix both of them.

Put ABS pellets in the container and start adding some acetone to it gradually. As you move the mixture around you can judge if you need more acetone or if you put in too much and need to add more ABS to the mix.

You want the texture to almost be like nutella chocolat spread.

Once you get the proper consistency, you then start spreading this on whatever part of the tank is broken. Making sure a very good coat is applied at least a few inches on both side of the crack.

The acetone will fuse the new ABS with the tank and evaporate as the ABS hardens.

you can either sacrifice the container and/or the putty knife or clean them using more acetone.

hope this can help someone

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Old 06-21-2016, 10:05 AM   #18
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Patching a crack in bottom of a grey water tank

Thank you SimonC for your detailed plan and advice. I do appreciate it. I have, however, already purchased my Plasti-Mend kit. Therefore, my plans at this point are to go ahead and use it, instead, because it was recommended by others in previous posts. I watched this U-tube video to get an understanding of the process. I should be moving ahead with this today or tomorrow. We have a lot on our plate here in Orlando this week so my schedule is iffy. Thanks again, for your interest. I will post pictures of my work as best I can.

plasti-mend utube application - Bing video
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Old 06-21-2016, 09:48 PM   #19
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Patching a crack in bottom of a grey water tank

Finally got to the actual patching and have pictures to prove it!
Put two coats of Plasti-Mend on this afternoon. Had to drill a hole in the bottom of the tank to get balance of water in tank to drain out so there would be no water to contaminate the patch process. You really have to have faith in this project to actually drill a hole in the bottom of one of your tanks. That was in the directions so I did it. The first two shots are of me and the equipment I used. I modified a piano dolly to have something I could scoot around on while on my back under the rig. That was a good idea; it worked well. I kept the black product in the refrigerator until I was ready to use it to help reduce unwanted evaporation of the solvents as per directions. It is important to leave the lid off the minimum amount of time so I opened and closed it after I went under the rig and was in positon to apply the product. So here is the prep equipment. Actual patch site to follow.

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Old 06-21-2016, 10:07 PM   #20
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Patching a crack in bottom of a grey water tank

Here is the actual crack I am patching. There was a small leak around where I drilled the hole that I had not seen earlier so that is where I drilled the hole. I got about a quart or two of water out that would not drain out through the regular piping.

This is what the patch looks like with one layer of patching material. The kit comes with two rectangular pieces of ABS plastic and two pieces of screen material to use to help strengthen the patch. I used the screen pieces for my job due to the slight curvature of the area around the cracks and the hole. I put a second coat on about two hours after I did the first. I'll put a third coat on tomorrow. I'll post one more picture after the job is completed. Clean up is with acetone by the way.

Thanks for all your help, guys. Can't tell you how much I appreciate it.
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