If you look at the image, you can see a slight discoloration by the nearest gun port. There might have been patches.
EDIT: The opposite wing on the plane behind it looks like it has a gunport patch as well. I'd leave them on.
I think the spinner would be black. Look at all the other spinners. They're a different color. This spinner looks almost identical to the anti-glare patch, so I'd go with black.
EDIT: If red is showing up as white, then that spinner definitely isn't red. The gun port patches are red in your skin. The patches show up as white in the photo, so I'd assume all but the BMF plane had red spinners. Its clearly got a different color.