Undercoat – Now if your doing grassy hills you’ll want to undercoat a nice muddy poo brown (because earth is brown and the green grass colour will come from the flock), or as artists call it ‘burnt umber’. Also worth noting is that artists paint tend to be very pigment heavy and stiff, this is good for us cheapskates as water and PVA are cheap. I tend to first add one part PVA to two or three parts paint then dilute with water till it’s gets to a usable gloopyness. This thinning of the paint tend to lighten it slightly but makes little difference to its coverage ;)