Prosealed and riveted right tank stiffeners, fuel cap flange and the fuel drain flange. Had no problems today with the fuel cap flange. I made absolutely sure to get the flange and skin flat against the back rivet board. Also riveted on plates to cover tooling holes in the end ribs of both tanks. Prosealed them as well. Then used a flashlight to inspect all the edges and rivets to make sure I had good coverage of the proseal. Touched up a few spots, but everything looked air (fuel) tight.
