Mixed tank sealant and started the learning curve of working with the proseal, riveting wet rivets and creating the fillet with a popsicle stick per plans. Riveted the stiffeners into place and completed the task of covering every rivet head and creating the fillet around each stiffener. Riveted the drain flange into place, as well as the fuel cap flange and clip for vent tube. Will start on the ribs in next session