Originally Posted by
markw
Yes, indeed it is! Just up the amount of Thinners and and use the Knife tool to blend out the paint where needed.
Doing the wash on separate layers mimics putting a wash over dried paint.
And the blend mode can sometimes help keep the underlying colours coming through.
In addition to the internet, if you like getting your information the old-fashioned way, you know, books, I can highly recommend James Gurney’s book ‘Color and Light’.