Black Tank Leak

[Nutinelse2do]

Not a crack, just weeping when the tank gets almost full. Found the spot.... It's the tank its self, not a fitting. Again... not a crack, and not the fittings.

What do we use to repair it?... Tried ABS Glue, which did nothing. Read on Bondic, and Flex Seal, which both get pretty crappy reviews.

What would be the best option to fix it? Fiberglass welding, glass cloth and 3m sealant, plastic tank repair kit?

Please let us know if something has worked for you. We really don't want to replace the tank.

Thanks for your time

[rjsurfer]

Plasti Mend worked great on my black tank, had crack in same spot. Make sure you do multiple coats and don't be afraid to spread it at least a few inches around crack.

In a pinch you can make your own, scrape tiny pieces of ABS into a glass then add some ABS thinner or Acetone to make a slurry.

Ron W.

[Nutinelse2do]

Thanks for the clarification on the tanks Byron. That's what our research showed too. Looking forward to getting it ( Plasti-mend ). Seems it will be the correct fix.

Thanks again!

[12thgenusa]

Plastic welding works very well on ABS and is not expensive. I have had two different repairs made on an ABS galley tank with excellent results, approximately $30 each.

[Old-Biscuit]

Plasti-Mend works very well on ABS

Black Waste tanks are ABS

Milky White or light Grey Fresh or Waste water tanks are polyethylene

[YC_1]

Amazing goop plumbing or marine type will stick to just about anything.

[golf_bears]

I accidently drilled a hole in the bottom of my grey tank about a year ago. I got some JB Water Weld from Home Depot. It's a two part putty material that you "knead" until the color changes. I applied it while the tank was still dripping. Once it set the leak stopped and hasn't leaked since then. Worth a try. I think it cost less than $5.00.

[TheSidwells]

hmm never know you could weld HDPE, good find.

[Nutinelse2do]

Hi.
Think its ABS. Ordered a Plasti- mend black tank repair kit.

It's about $50 with shipping, but supposedly it works.
Could not find any negative reviews on it, and has a 1 year guarantee.

Will report back after we try it next month.

Thanks all
Safe travels

[nomad_297]

There is no approved sealant for polyethylene, if that is what your tank is made of.

Bruce

[Puttin]

I have not personally tried this but here you go:

Black tank repair video

[bid_time]

I have had good luck with Mighty Putty; but, I have never tried it on HDPE. I have also seen what I think is a similar product at ACO or ACE called epoxy putty or something like that. I would advise reading the label first and see if it works on HDPE.