Washed and AFS clean/etched the tank stiffeners, reinforcement plates, access cover plates, fuel pick-up anti-rotation brackets, filler necks, ribs, and skins. Mixed up a small batch of Pro-Seal and put a 3/16" pop-rivet in the outboard ribs, installed the vent line fitting and capacitance gauge BNC fittings in the inboard ribs, and installed the fuel pickups in the access plates.