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Be sure especially to remove any chipping paint. If you leave the paint on, the patch won't adhere properly. And while you want to start with clean walls, never use a pressure washer because it can damage the masonry.
Use a quick-setting concrete for the larger cracks. Use a masonry brush or a trowel to apply the patch. Don't go too heavy.
For smaller cracks, consider painting – as we did – the entire wall with a latex paint designed to fill masonry cracks 1/8" or smaller (Image 1). Use a quality acrylic latex paint formulated for stucco. For rough surfaces, use a roller with a 3/4- to 1" nap (Image 2). Paint should dry to the touch in a couple of hours. If a second coat is needed, wait about four hours before applying.