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08-12-2019, 07:59 PM
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#1
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Junior Member
Join Date: Feb 2018
Posts: 18
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Need adhesive for a crack in black tank.
I have a small, about 1" crack in my black tank. It's way up high so it's only a problem if I let the tank get to full. It's in a difficult location, right on the trailing end corner where the tank sits on a piece of angle iron but it's accessible. I tried some of the "seen on TV" flex seal (I sawed my boat in half!) and that didn't hold worth a ding dang (being polite). I also tried some ABS glue that seemed to hold at the time but later on it failed. What I did was clean the surface of the crack then apply the glue. After 2 days of curing I filled the black tank with water and let it sit overnight to see if I had any leaks. The ABS didn't leak at the time but a couple of months later when I didn't monitor my black tank levels adequately it started to drip. I have the corrugated metal bottom panels on my 2008 Cardinal 5th wheel so it's a pain in the butt to access the tank. I want to fix it one more time and need advice as to what kind of adhesive will stick to these Elkhart Plastics tanks? I got a tube of 3M 5200 marine adhesive/sealant and unless I hear differently that's what I'm going to try next. This time I'll cut a groove along the crack with my Dremal so I can get adhesive inside the tank and along the outside instead of just applying something on the outside of the crack. I've already stop drilled the crack. I'd like to apply a patch over the crack and screw it to the tank but it's pretty thin and I don't think a screw would hold. Anyone got something I haven't thought of yet? Randy.
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08-12-2019, 08:17 PM
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#2
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Senior Member
Join Date: Mar 2014
Location: Mountain Foothills of Southern Alberta
Posts: 2,005
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I used Liquid Rubber on my black tank and it lasted for 5 years before I sold the trailer. This stuff is used for flat rubber roof repair, when it cures it turns into solid rubber.
__________________
2007 Surveyor SV230 - 200 Watts Solar/MPPT Controller - 220 AH Battery Bank (Two-GC2) - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting
2009 F150 - 5.4 Litre with Tow Package
Boon Docking 99% of the time.
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08-12-2019, 08:45 PM
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#3
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Senior Member
Join Date: Mar 2017
Posts: 2,481
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Proper way would be to have it plastic welded.
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08-12-2019, 08:56 PM
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#4
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Brake is on left
Join Date: Jul 2019
Location: USA
Posts: 1,095
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Worth a shot. I have used it on water tanks (stationary) but I do not know how well it will travel. . Use the card of ABS they provide as a patch.
https://easyabsrepair.com/product/ea...ng-repair-kit/
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08-13-2019, 03:22 AM
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#5
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Junior Member
Join Date: Nov 2018
Posts: 12
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Use flex seal tape. Great stuff.
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08-13-2019, 10:55 AM
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#6
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Junior Member
Join Date: Feb 2018
Posts: 18
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Thanks for the tips! I tried to find someone local who could plastic weld the crack but I think I'd have to drop the tank for access. If I do drop the tank I'll probably replace it.
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08-13-2019, 11:06 AM
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#7
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Senior Member
Join Date: Jul 2018
Posts: 308
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Don’t if you can get to it but I’d drill a small hole at the ends of the crack to help stop it from continuing. Then I’d use a heavy duty rubberized tape over the crack.
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08-13-2019, 11:06 AM
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#8
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,146
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I'd try Eternabond tape.
It has stuck to everything I've touched it to. (make sure you apply good pressure for adherence)
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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08-13-2019, 11:12 AM
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#9
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Member
Join Date: Jun 2019
Posts: 93
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Wonder how well 'eternabond' tape would work on that situation? That's assuming of course you could get good access to the crack.
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08-13-2019, 11:37 AM
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#10
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Senior Member
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 4,167
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I would clean around crack and then use a coarse sandpaper and sand couple inches each side. Clean with acetone and then apply a good exterior silicone caulking over the entire area.
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Fonzie
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
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Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
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08-13-2019, 11:48 AM
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#11
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,329
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Quote:
Originally Posted by wesfisher
Use flex seal tape. Great stuff.
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I can't imagine the tape works any better than the spray the OP said he used and it failed.
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08-13-2019, 11:52 AM
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#12
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,329
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Quote:
Originally Posted by 5picker
I'd try Eternabond tape.
It has stuck to everything I've touched it to. (make sure you apply good pressure for adherence)
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Agree with the suggestion of Eternabond. Once it sticks, it doesn't come off.
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08-13-2019, 11:54 AM
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#13
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Senior Member
Join Date: May 2017
Posts: 5,712
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Neighbor fixed his FW tank...had a complete hole in the bottom from a piece of a leaf spring that kicked up on the interstate. Used epoxy to put a patch over the hole, then covered the area with Eternabond tape. He travels with a "Full" tank of water all the time and it hasn't lost a drop this year.
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08-13-2019, 12:34 PM
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#14
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Senior Member
Join Date: Jul 2018
Posts: 209
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Quote:
Originally Posted by simiHal
Don’t if you can get to it but I’d drill a small hole at the ends of the crack to help stop it from continuing. Then I’d use a heavy duty rubberized tape over the crack.
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I agree with the recommendation to drill a hole at each end of the crack.
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08-13-2019, 12:45 PM
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#15
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Senior Member
Join Date: Jun 2013
Posts: 1,114
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I bought an ABS repair kit, it included some mesh screen, primer, sand paper and ABS glue. I then made a piece of angle out of some ABS flat stock by heating it with a heat gun and bending it in the vice. Set the angle over the split (similar, there was a split at the top end of the tank from filling too fast) and glued it all together. This was my freshwater tank on my last trailer. It still leaked just a bit but didn't bother me as it was 150 gallon fresh water tank.
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08-13-2019, 12:49 PM
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#16
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Senior Member
Join Date: May 2014
Location: Shenandoah Valley, VA
Posts: 515
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If you have Eternabond tape, I would try that.
We use a product called Bullseye Quick Patch here at work with great success on just about anything!
https://buyquickpatch.com/
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2016 Flagstaff 23LB
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08-13-2019, 12:59 PM
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#17
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Member
Join Date: Dec 2018
Posts: 91
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JB weld for plastic works well too
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2005 Yukon XL 1500
2018 Prime Time Tracer 20RBS
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08-13-2019, 01:04 PM
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#18
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Senior Member
Join Date: Jan 2018
Location: Raleigh, NC
Posts: 9,614
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Not ABS
Quote:
Originally Posted by nayther
I bought an ABS repair kit, it included some mesh screen, primer, sand paper and ABS glue. I then made a piece of angle out of some ABS flat stock by heating it with a heat gun and bending it in the vice. Set the angle over the split (similar, there was a split at the top end of the tank from filling too fast) and glued it all together. This was my freshwater tank on my last trailer. It still leaked just a bit but didn't bother me as it was 150 gallon fresh water tank.
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This tank is not ABS. It is HDPE. I don't expect ŔBS solvent to do anything useful. I'd go with Eternsbond
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Larry
"Everybody's RV is not like your RV."
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Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
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08-13-2019, 01:10 PM
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#19
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Senior Member
Join Date: Nov 2015
Location: Pleasant Gap, PA
Posts: 458
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I had success using Eternabond to seal a crack in my plastic shower surround.
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2015 Solaire 201SS
2015 GMC 2500HD Duramax
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08-13-2019, 01:12 PM
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#20
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,329
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Quote:
Originally Posted by nutdriver
I agree with the recommendation to drill a hole at each end of the crack.
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OP mentioned this in the first post.
Quote:
Originally Posted by Itswett
I've already stop drilled the crack.
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