That was from the
first time the wing was mated - then it was taken back off and finished (putty, sanding, and paint, as per done at the factory) before being re-mated a couple weeks ago. The guy that did that film, along with a few other great films about Aircorps, says that he will have a full film documenting the complete restoration of the aircraft, which should be spectacular to see.
The restoration of "Sierra Sue II" is really something else. The rivets, for instance, are a myriad of silver, yellow, blue, and in some cases red, all depending on their types of finishes and uses, as per original. In original color photos of Mustangs up-close, the rivets all over the fuselage are a mixture of yellow (iridite) and silver (anodized), and that is exactly how it is in the restoration (the blue rivets generally only show up on the wings, and the red rivets are exploding rivets, used wherever you can't get a buck). Up-close, you will also see remnants in areas from the period Alcoa and Reynolds aluminum die watermarks - just like from the factory, even though there was an effort to remove them, it wasn't a perfect/absolute removal. The aluminum itself has not been polished, and just left in the production finish as per original from the factory. Many of the parts throughout the airframe have streaks in the primer finishes, as again, per the factory, the parts were dipped in primer, in many cases, rather than sprayed. The stencils throughout the aircraft were done with ink-stamps, per original, so the stencils have nowhere near a perfect/even application when you see them up-close. The fuselage was assembled with all of the parts either being primered chromate yellow or green, or as in many cases, not primered at all, as per original, and the cockpit wasn't sprayed interior green until the fuselage was assembled, just like in original production, leaving behind 'overspray' in areas that the painter can't easily reach once the fuselage is assembled. And I can go on and on about this restoration. Wherever it shows up (such as EAA Airventure 2015), it's not going to have any possible competition as far as authentic warbird restorations go.
I can't wait to see how faithful they are to the original artwork. There have been some past depictions, but they are awful compared to the quality of how the original artwork really looked, given a photo that has come to the surface in recent years.
This is how it should end up looking, in its final markings of the war, with the lightning bolt.
