I tried to turn the wing over, but there isn't enough room between the table and the roof to do it by myself, so I decided to clean the surface with wax and grease remover, dry and then prime the upper surface (with emphasis on the rivet heads). I may even spend some time on this side sanding and priming, sanding and priming until I''m happy the rivet heads are properly sealed, then flip to the other side.
