Started today by soaking the rivets in acetone and mixed up a batch of proseal. Two cleocos were removed at a time (front and rear stiffener) and the holes cleaned with acetone. Once dry, I filled the holes with proseal and inserted the clean rivets and seated them as far as they would go.
Once seated, I back riveted the rivets in place. I then cleaned up the prosel from teh skin and back riveting plate, removed the clecoes, and repeated the process.
Once all of the rivets were set, I used the remaining proseal and covered up the entire rivet line on the stiffener and smoothed it out. I had enough proseal left to do just the rear stiffeners.
I'll mix a little extra to do the front ones tomorrow when I rivet the fuel drain flange and the fuel cap flange.
I had to drill out one rivet as it was not sitting flush with the skin. Nice and easy.