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Old 02-11-2025, 09:47 AM   #1
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Black tank leak

2021 Allegro Bus 35CP

We had the black tank flushed the other day. Now there is a leak (drip) on what looks to be a welded bead mark on the tank.

Are these tanks steel or aluminum? I thought they were plastic.

I was thinking about using JB Weld or plumbers putty to seal the leak.

Any thoughts of repair?

Thanks!
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Old 02-11-2025, 10:54 AM   #2
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Should be plastic. I have read others using JB Plastic Bonder successfully.

Don't think I would use that tank flushing company again...
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Old 02-11-2025, 11:44 AM   #3
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They are plastic and a JB Weld specifically for plastic is probably the best bet. Plumber's putty is not a good sealant. It is only used to seal between a sink drain basket and the sink and may take years to harden, then it crumbles apart.
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Old 02-11-2025, 02:01 PM   #4
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Several years ago we developed a pretty severe leak in our fresh water tank. I used J B Water Weld as a temporary repair to get through the remainder of our several week trip. I gave it a couple of hours and then filled the tank. Not a drip and the leak is still repaired.
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Old 02-11-2025, 04:57 PM   #5
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Thanks all

Gonna try the JB Weld “Water Weld”….follow up with results later.
THANKS!!!
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Old 02-19-2025, 10:23 AM   #6
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The JB Weld Water Weld seemed to work. The stuff works great but my fingers are crossed.....
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Old 02-19-2025, 06:50 PM   #7
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If it leaks, try the JB epoxy just for plastics, worked for me a few years ago and still good today.
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