This has been on my list of little tasks for a while now, so while I was waiting for the alt air base epoxy to set, I match drilled prepped and painted the closeouts that cover up the vertical spar box members. I prepped and painted them, but my last can of "good" primer is pretty old and it's throwing drops in the work piece. Once it dried I cut/smoothed the runs out, then covered it with a second coat of good old duplicolor gray. It's a bit lighter than my sherwin Williams gray, but since I'm eventually installing interior side panels I just need something that won't show bare aluminum through the edges of teh side panels and this will fit the bill.