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Can anyone tell me why I have water leaking out from under the actual sink? It’s coming from the overflow “Reservoir” area? The sink is draining completely fine otherwise. Just replaced the sink drain.

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    Seems like your work on the drain may have tweaked the old overflow trough adhesive and cracked it loose. Is that a possibility? – isherwood Aug 28 at 16:12
  • I don’t think I did, but possibly. Lol. That’s what I get for messing around with something I have no clue about!! I wonder if I could use silicone caulk to try and fix it? – Absmith1112 Aug 28 at 16:20
  • I don't think I'd try to repair that seal from the outside. I'd look at pulling that channel off, cleaning away the old adhesive, and re-bonding it. I'd use something stronger than silicone. Urethane might work. – isherwood Aug 28 at 16:23
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    I take that back. It's maybe worth smearing a layer of 100% silicone over the joint. Couldn't really hurt. Give it a good day to cure. – isherwood Aug 28 at 16:24
  • Ok!!! I’ll give the silicone a try and see how it goes! At this point I’m willing to try anything!! Thank you for your help!! 😊 – Absmith1112 Aug 28 at 16:28
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I agree with Sfors on trying to seal up the leak areas, as this will make plunging a future clog in the primary drain possible.

Although, the rust and leaks being that high up tells me your overflow's outlet into the primary drain is blocked and the overflow is staying mostly full, instead of freely draining straight through.

The overflow's outlet is a side port hole just below the primary drain's opening, so you may have access to it to confirm it's a real drain (there was a very stupid period when they were just for expected appearance) and is cleared when fished from the overflow inlet above.

Now, if you don't see a side port inside the primary drain, then the wrong drain was put into the sink with the overflow being totally deleted as a drain and does indeed just fill up...until it finally turned itself back into a drain, the wrong way.

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Looks like the integrity of the sink bowl has been compromised. Looks like it's time for a new sink! Is it cast iron? Seems to be rusted through, especially on the left side of the pic. You could try repairing it with some spray on rubber sealant like FlexSeal or something similar

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    I don't think it's rusted through. There's barely any rust showing, if that's rust at all. – isherwood Aug 28 at 16:23
  • Yes, I believe it is cast Iron. The inside of the sink looks just fine though. No rust at all. You think i could try silicon caulk around it to seal it? Im a military wife trying to fix this mess on my own and I’m pretty clueless....lol – Absmith1112 Aug 28 at 16:23
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    Silicon caulk might work and it's probably cheaper than something like FlexSeal but I've seen amazing things (on TV) with the latter that might make a more permanent seal/repair. Worst case scenario, you could always try repairing with silicon caulk then if it doesn't work, just remove it. Another option is to talk to some guys about products they sell to seal water at a place like Ace Hardware, Lowes, Home Depot, etc. It really looks like the center membrane seal is no longer good - but if you seal it, seal from front to back - the whole thing - so the water doesn't just go somewhere else. – sfors says reinstate Monica Aug 28 at 16:50
  • Oh, and if there's rust, since it's cast iron, if you don't use something like rust converter, the life of that sink is even more compromised. Basically, sealing it is applying a band-aid to the whole thing and it's ticking time bomb that will just leak on down the road because the rust will get worse. – sfors says reinstate Monica Aug 28 at 16:54
  • The cool thing about cast is it takes decades to rust out. Ever heard of cast drain lines? Raw cast inside and out . I have owned homes with cast drain lines that were still in good shape and over 100 years old. My current house they are only 90 years old. – Ed Beal Aug 29 at 16:46

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