Started priming the ribs and braces tonight. Weather was perfect for painting; 75 degrees with low humidity. Very happy with the results. Only problem I had was identifying the ribs. I marked them with a vibrating pen but it turned out that the primer is thicker than the marks. I could just barely see all but one pair and I had to remove the primer to see which was left and which was right. I turned the pen up to a higher setting for the next marks.
I'm using Napa's 7220 self etching primer. I first prepped the parts with a maroon scotchbrite pad and followed with a good wipe down with MEK.