Hi
A warm welcome to this great forum of Märklin friends
The colour of the 410NG then 7186 has changed over the years and was NOT uniform.
Here is a video on my 1951 410 NG turntable

As you may see, in this version:
- the border and the bridge are middle grey
- the circular rack zone and the track on the bridge is dark grey
- the pit's bottom is medium beige / cream colour
- cabin is silver, window rims in white, roof in dark bordeaux / brown

Here is a 7186 from approx 1961



Later 1958-1975 the 7186 was like this

- reduced nuances of colours, medium grey
- darker nuance on the track on the bridge
- cabin's roof still Bordeaux, no red glob for light

I hope this helps a little
Jean

Thank you so much! I just checked and mine does not have a light in the cabin. Also, the box that it came in is the lighter blue color. Would this help in determining the era and colors?

Thank you so much! I just checked and mine does not have a light in the cabin. Also, the box that it came in is the lighter blue color. Would this help in determining the era and colors?

Hi

The light blue box colour is typical of the 2nd half of the 60s (1965 to 1970)
Ideally, the mix of 2 paint colours (dark grey and medium grew covered with satin varnish) would be great using an airbrush

Here is the box of that time

and here is the decoration à that time

Sounds like a nice project.
Cheers
Jean

As the result will not be the original paint, you can paint it the color you like...
If you google images of the turntable you will see the different variations. Of course the exact RAL will not be displayed :-)
There is at least one version where the color of the base circle is darker in the outer part and gradually goes lighter to the center of the circle. Then the border
is also not homogeneous in that it kind of have dots imitating gravel (that's what it seems to me).
In Youtube you can see some videos of turntable weathering, which may also produce even a better look.

Miguel