Trouble is, there isn't enough time between this film and ANH for all that weathering to happen naturally. And even if it did, it's so weathered that even if they had painted over the blue, some of it would be revealed again.
They should have come up with red stripes that happen to hit all of the red panels that remain in ANH.
They should have come up with red stripes that happen to hit all of the red panels that remain in ANH.