How to Sand Concrete Walls

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Things You'll Need

  • Dishwashing soap

  • Water

  • Sponge

  • Hand-held grinder

  • Diamond polishing pads


Choose paints and stains formulated for concrete and masonry. Paint will absorb quickly into the porous concrete. Use a primer to reduce the amount of paint that you will need.


Wear gloves, a mask and goggles to protect your eyes and lungs from concrete dust.

Concrete walls are a blank canvas. They often have a cold and industrial feel. If cold and industrial isn't the design style you are aiming for, remedy the problem by polishing the walls to a high shine. Once the walls are sanded and polished, you can coat them with a clear sealer, stain them or paint them to match your décor. Polishing concrete takes some muscle. If you are feeling strong, you can do this job yourself with the right tools and a lot of hard work.


Step 1

Wash the walls with dishwashing soap and water. Remove the soap residue by rinsing the walls with a sponge and clean water. Allow the walls to dry overnight.

Step 2

Attach a diamond sanding pad to a hand-held grinder. A diamond pad is the only type strong enough to cut through the upper layer of concrete.

Step 3

Press the grinder to the wall and begin applying firm pressure. Move the grinder up and down and back and forth across the wall. After a few minutes the concrete will begin to have a slight luster. You'll want a high shine for clear sealant and stain. For paint, it's necessary to remove only a small part of the top layer of concrete. Continue sanding until you get the shine you want.

Step 4

Wipe the walls with a damp towel to remove the sanding dust. The wall is prepped and ready for paint, stain or sealer.



Lisa East Hunter

Lisa East Hunter is a consultant and freelance writer in Phoenix. Her background in marketing and technology led her to explore all avenues of writing. She is currently dividing her time between freelance writing and her consulting business. Hunter has a Bachelor of Science in management information systems and marketing.