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The left fuel tank is leak free!!! The water level dropped the first day, but the temperature was lower. I pumped up the tank a bit more, marked it again, and watched it for another day. It held rock steady. Loctite 290 is a great solution for a leaky rivet.
I spent some time cutting and sanding down the extra ProSeal I had put on the baffle-to-skin rivets. This build-up was interfering with the inboard part of the wing spar reinforcements and preventing the tank skin from laying flat.