Today I used a screwdriver to apply JB Weld to seal the opening in the tank that leads to the front down tube. At least that was easy, and only took about 5 minutes.
The rear area around the seat post was a different story. It's sealed now with the E6000 adhesive I bought, but at great effort. When I poured it in, I thought it would just plug up the passage and dry, but that's not exactly what happened. It slowly ran past the seat post passage, and into the rear frame like a slow motion mexican jail break. When I checked on it the first time, after about an hour, it was starting to run out one of the condensate holes down by the dropout in the rear frame. When I looked down in the tank with the bore scope, it was nowhere in sight. I immediately turned the frame up and after a while, the adhesive started showing up back at the seat post. That started a long process where I had to keep rolling the adhesive back and forth past the seat post till it dried enough to finally plug it up. It only took about 3 days to completely get it blocked. Remind me not to try that again lol.
If it wasn't for the bore scope allowing me to see what was happening down there, this might have turned out worse than thanksgiving at the mother in laws lol.
I'm going to wait 24 hours for the JB Weld to cure, and then I think I'll wait another day just to make sure the E6000 is good and hard.