So I use a more sandy version than
GW’s orange, but yes, I’m afraid it’s 2-3 coats to get the depth of colour right.
I don’t have great photos uploaded at the moment, but I use Vallejo desert sand as the primary colour and earth as the secondary:
The earth colour has better coverage, so you can use that as an all over base; I don’t, but only because it changes the colour of the yellow somewhat, so if I started doing it the new stuff wouldn’t match the old.