How to Patch Masonry Walls

Learn how to patch walls before painting them.

Highlights:

Step 1: Scrape Off Existing Paint
Step 2: Apply the Concrete to Large Cracks
Step 3: Apply Paint to Small Cracks

Step 1: Scrape Off Existing Paint

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.

Step 2: Apply the Concrete to Large Cracks

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.

Step 3: Apply Paint to Small Cracks

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.