No more riveting could be done until I got the other skin of the horizontal stablizer primed. So today was the day of priming more parts. As seen in the photo, I sat outside in the sun working on the plane with a pad of Scotch-bright. Just a "before and after" type of photo of the surface prep. Just scuff it up gently to a smooth satin finish, then it's ready to prime after a cleaning with acetone. No other photos since this was just a simple repeat procedure again. I also primed some more of the never ending pile of stiffeners.