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Your shop bill is going to be probably $50 to $75 and hour. Welding shop will be on the higher end. If you can finish this project for $200 with a new tank, pull the trigger on it and start taking yours out while it's on the way.
OK, finally my gas ran low enough and I got around to fixing this.
I must confess that, for now, I took the quick and dirty route. I removed the previous patch and sanded it down. See the first picture. You can clearly see that the leak is due to a puncture, not rust.
I then put on an epoxy putty, the POR-15 . It was expensive ($30) but highly recommended based on my reading. I used 1/4, but ended up with too much, could've used about 1/10. See patch afterward.
I will try to update this thread with the status of the patch in a year... or sooner, if it doesn't last that long.
I don't know, Artem....I don't see any liquid flow....no wetting action. I see shadows at the edges of the putty. It's gonna come off as one big gob later on.
Just wanted to give a year-later update. On top of the POR-15 patch, I applied some rubberized spray paint to protect it from water. The patch seems quite sturdy and has held on great so far -- no problems at all.