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We experienced a leaking black water tank a couple of years ago. It was from a seal leak at the pipe entry into the tank due to flexing. Bob tried all of the RV fixes, none of which worked, and finally used two marine products, Marine-Tex and 5200 (a 3-M product). He cleaned the area, applied the Marine-Tex, let it set up overnight, then applied the 5200 on top of that. He also put tapered wooden braces (2x2) under the tank, attaching them to the frame with screws, to prevent further flexing. So far, and after many miles, no more leaking. Hope this helps.
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