This was a busy session of spraying self-etching primer onto both sides of the right wing ribs, plus a few of the brackets that get attached to them. Hunching over to spray so many parts on the floor for so long gets a little painful, so maybe I'll consider setting up a folding picnic table next time.

What's next? I need to use the step drill to make some holes for bushings (which I probably could have done before priming), and then start riveting these ribs into place.