Bonjour, Torio
Just found your post. Early production Skyrays, as well as the 2 prototypes, were painted dark blue for some time. A few of these were repainted later in the light gull grey/white pattern, while others remained blue. There is a big picture of one of these at
http://www.nawcwpns.navy.mil/clmf/happyhelmet.html
Try a Google search on "NOTSnik" for other photos of this A/C. At some point this F4D had the underside of the wings painted fluorescent orange.
Regards,
Dick