Today was nice and hot, good weather for applying primer to the outer skins.
First, I needed to clean up the outer skins with acetone.
After that, it was time to start applying Rustoleum Painter's Touch gray primer. As I've mentioned before, I choose gray primer when painting white so that I can tell when the white paint has supplied full coverage.
Four coats later, and the skins are ready for light sanding and painting.