Fantastic entry, Franco @franco_speciale_damiani
You did some great work already, all looking fine.
I agree that the fuselage seems to have a grayish tint.

Another source go to "Inch High Guy" he has a section on the "Vought OS2U Kingfisher Pacific Theater Camouflage And Markings" His references are based on time periods of the WWII. With regards to marking directives, "On 30DEC41 BuAir is issued a directive that all Fleet aircraft were to be camouflaged. Ship-based aircraft types were to be painted in non specular light gray overall,".

1 attached image. Click to enlarge.

thank You Stephen I will do more research following your directions. the photo I posted you can find here:
https://www.warbirdsresourcegroup.org/NARG/os2ukingfisher.html

Excellent job so far, Franco (@franco_speciale_damiani)! Indeed, the fuselage looks to be light gray, cannot comment on the wings' shade, though.
Looking forward to your progress!

Franco, using your link and then zooming in on the photo, I offer these observations for what they're worth. These birds have national insignia on the top of both wings. The horizontal stabilizers and elevators are the same color as the wings, and both look darker than the fuselage. Were they the same color, the horizontal surfaces should look lighter than the more vertical surfaces. The floats of 64 and 54 might be the fuselage color on top with the lower lighter color brought up higher than 6? in the far back, whose float looks to definitely be in the fuselage color. 66 and 68's floats are lighter yet than the upper fuselages, indicating that they are either a different color or freshly painted with no or very little of the fuselage color on the top. The outboard floats seem to match the main floats pretty much. If you look at the wing and elevator shadows, the sun is coming from above and behind us as we view the photo. The next to last photo in your link is a color shot (original or processed?) that does show OS2Us with yellow wings with obvious black walkway markings (missing n your photo) and what appears to be aluminum dope fuselages. The Navy did use all-aluminum coloring very briefly in early 1940 before switching to all-gray through most of the summer of 1941, and then to two-tone gray in late-summer 1941. Your photo is captioned as from 1941 and the planes from the newly opened NAS Corpus Christi, the largest naval training center of its day. A case might be made for one or two-tone gray with training yellow wings and an as yet unpainted aluminum float. All of this is very conjectural as photographers back then often used colored filters to bring out or reduce b&w contrast. This link is one of several helpful but not conclusive sources: https://tailspintopics.blogspot.com/2012/12/early-world-war-ii-usn-paint-and.html

Hi, Franco (@franco_speciale_damiani). Nice work on this Kingfisher. I built a Monogram Kingfisher on wheels a year or so past. It takes a ton of work to get an accurate, detailed model. In my research back then, I can tell you that paint colors get more and more complicated and confused the more you look. This is especially true when using WW2 black and white photos for your source. There were lots of exceptions to the painting rules, especially early in the war and especially on training bases. My guess is that it might be a faded blue-gray on the fuselage and an aluminum float. Good luck. Looking forward to your progress.

2 attached images. Click to enlarge.

Thankyou Christopher for your detailed and helpful observations I will look at the link you sent me. I am glad that the livery could be as you said because it is certainly in pole position among the many. thanks again