I started with a tan filament. I painted the lake with the dark blue. Then I painted rings around he center getting lighter, with the lightest color used for the rivers. Along the rivers I painted the canyons black. I then dry brushed with increasingly light shaded of grey. I used a light brown along the shore to make the beach. Finally I used a very dark brown on the hills, and dry brushed with increasingly lightened shades of brown.
No primer. The borders are the original filament color.