Well, I've got two layers of mesh tape layered between many more layers of ABS paste. It might just work. The stuff is hardening up nice, and there's no moisture seeping out anywhere. The trick was to apply a very thin layer of paste on top of the mesh tape, and then as it starts to tack up, make sure the tape is pressed up into the preceding layers, otherwise the tape sags and pulls the paste with it leaving a gap behind it. I think this is where the water ran out from before...
I'm hopeful, but just to be safe, I'm going to wait another week before I put any additional "stuff" in the black tank just to be sure it's cured up nice.
The repair looks the same as before, so no additional pics... and actually, photobucket has frozen my account because apparently they've changed their policy on 3rd party hosting, so I can't post any new pics anyways. And actually, all the pics on the engine rebuild thread and this thread may end up disappearing unless I pay for an account... which I won't be doing. That website literally FLOODS you with advertisements, which is how they pay for users to have free accounts. It seems crummy that they can change the terms of use at will, but I guess it is what it is.
Which is a bummer because I also installed 4 pc fans at the top of the refrigerator vent on the roof that I'd like to post... It was a free upgrade since I reclaimed the fans out of old computer power supplies. They use .8 amps total and move tons of air (the two old squirrel cage pc fans were 1.4 amps total). The best thing is that the air motion is a positive displacement inside the space behind the fridge, as opposed to the previous fan setup I had down at the base of the cooling unit that just kind of circulated the hot air around back there. I turned the fridge on just to test it, and overnight it dropped to 30° in the lower box... Even with an empty box.
Never did that before... EVER. Very cool. Pun intended.
All for now. If the black tank repair holds, then the only real repair left from the last trip is the generator exhaust... replacing the siding on the driver's side is off the table for the foreseeable future...
-cheers