Finished sanding, deburring the stiffeners, then clecoed everything together and match drilled, then did the disassemble, and the deburred the skin holes and edges, put slight bend in the trailing edge, dimpled the skin to stiffener holes and all of the stiffeners, Scotchbrite the stiffeners and the skins. Primed same. (This time I used Sherwin williams rattle can 988, it went really fast and didn't have to wait too long to dry, then back riveted the stiffeners to the skins. A little tricky to get the skins oriented the right way and the stiffeners on the right side of the skins
