How to Paint Cinder Blocks

Cinder blocks are a common building material that can be used on both the interior and exterior of a home. Most cinder blocks come in a gray color, but you can paint cinder blocks to match the color scheme of your home. The process of painting can be broken into 3 simple parts, including cleaning, priming, and painting.

Priming & Painting Cinder Blocks

Choose a bonding and filling primer that’s latex acrylic-based and apply with a nap roller. Let the cinder block dry for 24 hours, then apply a high-quality acrylic latex paint in any color. Let dry for 12 hours before adding a second coat.

Part 1

Part 1 of 3:

Cleaning the Cinder Blocks

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1
Remove powder deposits with masonry cleaner. Some cinder blocks that have been exposed to water through a leak will develop a white powder coating on the outside. It can be removed by scrubbing the deposits with cleaner and a scrub brush. Allow the cleaned areas to dry completely before washing the walls further.
- Alternatively, you can mix the masonry cleaner with water in a 1-to-1 mixture in a pressure washer and clean the surface of the cinder blocks with the pressurized mixture.
- To avoid future deposits after painting, locate the cause of the leak and repair it appropriately before priming and painting.
2
Use a putty knife or paint scraper to remove any current paint. Cinder blocks are mostly all a shade of gray or taupe, so if your blocks are another color or have a shine to them, they’re probably painted. Lift off the paint with the edge of the scraper. Chip away small portions at a time until as much of the paint is removed as possible.
- Don’t worry about very small pieces that are still present after you remove most of the paint. You can normally scrub these off with water or paint over them without any problem.
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3
Wash the blocks with a pressure washer or hose and scrub brush.^{[1]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} Using a pressure washer on a mild pressure level of 1500-2000 psi will get the job done quickly, but it’s okay if you don’t have access to one. You can use a regular garden hose to spray down the blocks and then scrub with a brush to remove dirt.^{[2]XResearch source}
- Avoid using soap in the water because it will take longer to dry and isn’t effective for cleaning bare cinder block.
4
Allow the blocks to dry for 48 hours after getting wet.^{[3]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} The primer won’t stick if it’s applied to wet cinder blocks. If you’re working inside, open windows or turn on fans to allow the cinder blocks to dry out quickly.^{[4]XResearch source}
- Be patient. If all of the blocks aren’t dry after 48 hours, you should wait a couple more hours before priming.^{[5]XExpert SourceAndre Kazimierski
  Painting SpecialistExpert Interview. 26 January 2022.}
5
Seal cracks with polyurethane caulk. Purchase a tube of caulk at the hardware or home improvement store and locate any cracks in the cinder block. Cut about 0.25 inches (0.64 cm) off the tip of the caulk and push the caulk to the tip of the tube with your hands or a caulking gun. Then, apply the caulk to the crack liberally, covering the joint completely.^{[6]XResearch source}
- For a smooth finish, run a razor over the applied caulk to flatten the joint and make it blend with the rest of the block.
- You can also use this method to seal cracks between individual cinder blocks and protect against water leakage.

Part 2

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Priming

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1
Select a bonding and filling primer.^{[7]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} At the hardware or home improvement store, look for primers that are latex acrylic-based. These will work best for most cinder blocks and will fill in any cracks and pores in the blocks and neutralize the pH while you’re painting.^{[8]XResearch source}
- If you’re painting an area that has a water leakage issue, such as a basement, or painting blocks that are located outdoors, look for a waterproof primer.
- Bonding and filling primer will work for both smooth and split-face cinder blocks.
- Make sure you measure the height and length of each wall, and add the areas of each wall to find the total that you’ll be painting before you go to the store. Then, ask the sales associate for a recommendation on the amount of paint you should purchase based on the area.
2
Apply a coat of primer using nap rollers.^{[9]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} Use long, even strokes when applying the primer. Depending on the roughness of the blocks you’re painting, use a 0.5 in (1.3 cm) nap roller for rough surfaces or 0.25 in (0.64 cm) nap roller for smooth surfaces.
- One coat of primer will be plenty if you’re painting over with a different color. If you’re only priming the blocks, a second coat will ensure the paint sticks and prevent wear over time.
It’s important that the primer is completely dry before you begin to apply the next coat. Check on the blocks after 24 hours. They should be completely dry to the touch with no transfer onto a finger or glove.

Part 3

Part 3 of 3:

Painting

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1
Purchase high-quality acrylic latex paint.^{[10]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} Cinder blocks require a durable paint to hold up to wear and tear. Latex paint with acrylic will provide the best coverage and the smoothest application for both smooth and split-face cinder blocks.
- To determine how much paint to buy, use the same area measurements that you used to purchase the primer. Ask a store associate how much paint they recommend for the area, which will vary based on the brand.
- At the hardware store, purchase a half-gallon of extra paint in case you need to touch up the paint in the future.
- If the paint will be on exterior blocks, select a paint that is also weatherproof to prevent damage from the elements.
2
Apply an even coat of paint using a 0.5 in (1.3 cm) nap roller.^{[11]XExpert SourceAndre Kazimierski
Painting SpecialistExpert Interview. 26 January 2022.} It’s important to work slowly and with a little bit of paint at a time to ensure an even application and prevent dripping, which will be visible on the cinder blocks. Work vertical sections, covering as much as possible with long strokes of the roller.^{[12]XResearch source}
- Try to avoid overlapping sections, as these will take longer to dry and can give an uneven look to the first coat.
- If you have smaller areas that need to be painted, use a nylon polyester brush.
3
Allow the first coat to dry for 12 hours. Keep the room well ventilated with fans if you’re working indoors, and check on the paint after 12 hours to ensure that it’s completely dry. Do this by touching the paint gently with a rag or gloved finger. There should be no transfer.
- If you live in an area that’s more humid, you might need to wait up to 18 hours before the paint dries.
4
Apply a second coat of paint using a 0.5 in (1.3 cm) nap roller. Like the first coat, you’ll want this to be as even as possible. Work slowly, taking a little bit of paint on the roller at a time and applying in long, smooth strokes.^{[13]XResearch source}
- For hard to reach or tight places, you can use a brush, but your brush strokes may be visible on smooth cinder blocks.
5
Allow the paint to dry for 24 hours. Keep the room area ventilated with fans if you’re working indoors. Test to see if the paint is dry by touching it with a gloved hand or rag in an inconspicuous area. There should be no transfer.
- If the second coat isn’t even or you want better coverage, you can apply a third coat to the blocks. Be sure to wait at least 12 hours before applying a third coat.

Expert Q&A

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Question
Why do you have to wash cinder blocks before painting?
Andre Kazimierski
Painting Specialist
Andre Kazimierski is a Painting Specialist and the Founder and CEO of Improovy, an on-demand house painting service startup. With more than 15 years of experience, Andre and the Improovy team use data and technology to streamline the home improvement process for homeowners and painting contractors. Andre started in the painting industry as a sophomore at Depaul University in Chicago, working with one of the nation’s largest painting companies to launch new cities and territories across the Midwest. Years later, he started 3rd Gen Painting and Remodeling and had a successful exit after growing the company to two different states.
Andre Kazimierski
Painting Specialist
Expert Answer
It is important to really clean the blocks before the whole process. Letting it dry is also extremely important. If you don't give the blocks enough time to dry, the primer will start bubbling up.
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Can I use spray paint on cinder blocks?
Andre Kazimierski
Painting Specialist
Andre Kazimierski is a Painting Specialist and the Founder and CEO of Improovy, an on-demand house painting service startup. With more than 15 years of experience, Andre and the Improovy team use data and technology to streamline the home improvement process for homeowners and painting contractors. Andre started in the painting industry as a sophomore at Depaul University in Chicago, working with one of the nation’s largest painting companies to launch new cities and territories across the Midwest. Years later, he started 3rd Gen Painting and Remodeling and had a successful exit after growing the company to two different states.
Andre Kazimierski
Painting Specialist
Expert Answer
You can spray it on, but I typically wouldn't recommend it, unless you know your way around the sprayer or hire a professional to do it.
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If How.com.vn has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support How.com.vn
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Warnings

Use drop cloths or tarps to protect surfaces from paint drips and spills. This is important for both indoor and outdoor painting, to protect your floors as well as the environment!
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Always paint in a well-ventilated area, and wear clothing that covers your skin for protection.
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