Kimberly, I have a different method of adding overlays to correct colors or values. I usually let my paintings dry for a day before returning to them, and then if I have a subtle or not so subtle change I want to make I use a bristle brush with a little of the color, usually enhanced in hue or value, and lightly brush it across the area I want to work on, so that the texture of the canvas picks up the paint very slightly. I can go over it repeatedly to deepen the color and the effect, and I have a lot of control over how much and where. There's no edge effect because it's brushed on so lightly; it's easy to feather it into the surrounding area so there's a good transition.
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