How to fix leaks in concrete and steel bulkhead
In the end - the issues was as I expected. I saturated the area with my garden hose and observed where the water was coming in - which was mostly through the wire penetration.


I dug down to below the wire and removed the wire. I scrapped away the old sealing that had failed, and then used an angle grinder with a flap wheel to bring the hole to bare metal on both sides.



I created a rivet of JB Weld SteelStik and pushed it through the hole, smoothing it with my thumb on both sides. Once that had set - I coated both sides in a thin JB Weld Steel Epoxy. When both had dried rock hard, I painted them with metal primer.

For the long cracks - I scraped out the old sealant that was failing - and used the angle grinder again to clean the area out, removed rust and even the faces where the metal touched the steel. I filled the whole area with Dynaflex 230 waterproof sealant. I used a chip brush to really force the sealant into the crack and paint it on to the area. I then used a rubber detail tool to press it in, and smooth the bead.


I got a big rain storm 2 days later, and everything I fixed held bone dry, but I did find 1-2 other small leaks that will need to be fixed used the same techniques.