Mixed various hues to make a grey to paint the station walls.
It looks less plastic-y, at least.
Unfortunately, I did not achieve the same shade as the loco shed

, so I used the leftover station mix to adjust the shed.
The photo is greyer than what my eye sees. To the eye, the original shed shade shows up, especially in the mortar lines.
And the last drops in the dish I skimmed onto one wall of the platelayer's shed to lighten it up a bit.
So now I have to achieve the same mix

for a second coat on the station and more shading on the sheds.