Before you take on the task of painting a concrete wall, inspect the wall for cracks and holes. Even though concrete is a hard, durable product, it is susceptible to damage. Repairing these unsightly holes is a simple process for most do-it-yourselfers.Taking the time to prepare your wall before painting will provide a uniform surface that will ensure a successful project.
Clean out the edges of the hole using a hammer and chisel. Make the hole wider at the base for better bonding of the patching material. For smaller holes use a screwdriver to scrape out the hole.
Scrape away loose concrete and debris with a wire brush. Clear dust from the hole with a damp rag. Dust will prevent the patching compound from adhering to the surrounding concrete.
Prepare concrete patching compound according to manufacturer’s instructions.
Spray the hole with clear water. Keeping the area damp prevents the patch from separating from the surrounding concrete.
Fill the hole with the compound using a pointed trowel. Press the mixture into the hole to remove any air bubbles.
Smooth the surface with the flat edge of the trowel. Feather the material away from the repair, making the surface match the surrounding area.
Spray the patch with water to keep it damp for at least 24 hours.