Use liquid acrylics, thin w/water to consistency of cream) & flat brushes. you can mix tints: titanium white w/lighter shades, add a dab of burnt umber for an earthy tint. for a warm, neutral , paint canvas w/a wash of titanium buff (1 tB mixed w/4 cups water. don't skimp on amounts; to paint a solid color on a door-size canvas, you'll need about 2 cups. Use airtight jars to store the colors you've blended.