Started with the scarf joint on the right outboard wing skin. Filed the inside of the corner, then finished with 400 grit sandpaper. Scuffed up all of the rivet lines on the inside of the skin. Prefer to scuff before it gets dimpled—man those dimples really shred the maroon pads! Repeated this same exercise for the left wing. Left tank still on test—up and down with the temp.
