I found I don't have the fuel vent line fitting sleeve, AN819-4D, can't rivet the inboard fuel tank rib. I have to order and wait for the part. OK it is time for leading edge. I started by removing the plastic cover along the rivet lines on the skin, then deburred the ribs. After cleaning the ribs using acetone, I got them primed.
Leading edge ribs are primed after deburring and cleaning
Blue plastic cover is removed along rivet lines on the skin