Today, I removed the clecos from the tank stiffeners. I then placed proseal in all rivet holes and placed rivets into the holes. I then back riveted all stiffener rivets. I then removed the riveter's tape and cleaned excess proseal from the outside of the tank skin. I then sealed the shop head of the rivet. Finally, I placed proseal on the bottom seams of wing ribs for the right wing tank. I cleco'd ever hole and left the tank to set over night.