Cinder block walls are popular for interior and exterior walls due to their durability and affordability. However, they can be challenging to paint due to their porous nature and rough texture.  

If you don’t paint them properly, they can quickly flake or peel off, leaving the wall unsightly. This is where we come in.  

Today, we will share tips on properly painting cinder block walls. So, if you want a painted cinder block wall, this article is for you.  

Get Rid of Old Materials 

Before painting cinder block walls, removing any old materials, such as dirt, grease, or loose paint, from the surface is essential. You can use a stiff-bristled brush or a pressure washer to scrub the walls thoroughly.  

You can use a mixture of water and trisodium phosphate (TSP) to clean the surface for stubborn stains. You must wear protective gloves and eyewear when working with TSP as it can be hazardous to the skin and eyes.  

Rinse the walls thoroughly with clean water and let them dry completely before proceeding with the next steps. 

Clean the Wall 

You must clean the surface thoroughly to ensure the new paint adheres properly. First, use a stiff-bristled brush to scrub the walls and remove any loose dirt or debris.  

Next, mix warm water with a mild detergent or cleaner and apply it to the walls using a sponge or brush. Be sure to work in small sections, rinsing each section thoroughly before moving on to the next.  

Wait for the Wall to Dry Up 

After cleaning the cinder block wall, it’s crucial to let it dry completely before painting. The drying time can vary depending on the weather conditions and the area’s humidity level.  

To ensure the wall is completely dry, professionals recommend waiting at least 24 hours before painting. 

In humid areas or during colder months, you may need to wait longer for the wall to dry completely. You can also use a fan or dehumidifier to speed up drying.  

Before painting, inspect the wall’s surface to check for any dampness or moisture. Painting on a damp surface can cause the paint to bubble or peel, resulting in an uneven finish. 

Apply Primer 

Apply the primer using a roller or paintbrush, starting from the top of the wall and working your way down. Make sure to apply the primer evenly and cover the entire surface. Allow the primer to dry completely before painting, usually for about 24 hours.  

If necessary, apply a second coat of primer to ensure the wall is fully covered. 

Paint the Wall 

When painting a cinder block wall, it is important to use high-quality masonry paint. Make sure the paint can withstand the porous and textured surface of the blocks.  

Start by using a roller to apply a generous coat of paint to the surface, working in small sections to ensure even coverage. Once the first coat has dried completely, apply a second coat to ensure a durable and long-lasting finish.  

Allow the final coat to dry completely before removing any painter’s tape.