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How to Repair Painted Cement Walls

Cement walls poured and cured properly create strong durable surfaces that can prove highly resistant to any but minor damage. However, damage does sometimes occur. When it does, even the smallest crack can pose a danger, possibly growing in size over time to threaten the entire structure of the wall. You can make repairs though, as long as the structure remains largely intact. With paint on the walls, however, a few steps will extend the repair process to repair and restore the painted surface as well as the wall it covers.

Things You'll Need

  • Wire brush
  • pH-neutral cleanser
  • Nylon brush
  • Sponge
  • Rags
  • Cold chisel
  • Hammer
  • Joint repair sealant
  • Putty knife
  • Brush
  • Epoxy gel adhesive
  • Shrink-resistant repair mortar
  • Trowel
  • Sanding block
  • Sandpaper
  • Epoxy paint
  • Paint roller
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Instructions

    • 1

      Remove any peeling or flaking paint from the repair area with the wire brush. Clear any debris from the damaged site with the brush as well, cleaning out any cracks or crevices in the wall completely.

    • 2

      Chip away loose stone from the wall with a chisel and hammer. Place the chisel against the base of the hanging piece of stone, and strike it firmly with the hammer, cutting the piece away.

    • 3

      Wash the surface of the wall surrounding the damaged area, as well as within the cracks with a pH-neutral cleaner. Use a nylon brush to wash within the cracks and holes in the wall, and a scrub brush for the area surrounding them. Rinse off the wall with clean water, and allow it to dry for six hours.

    • 4

      Begin repairs with small cracks or openings in the cement measuring no more than 1/4 inch in depth or 1/8 inch in width. Fill these small areas with joint repair sealant, using a putty knife to stuff the area to the top with the material. Scrape the edge of the knife along the surface of the patch after filling it to level the patch with the surrounding wall surface.

    • 5

      Prepare larger damaged areas for filling by brushing the inside of the damaged area with an epoxy gel adhesive. Wait for the adhesive to dry until it reaches the tacky stage -- still sticky but not wet. Fill in the damaged area with shrink-resistant repair mortar. Use a trowel to apply the mortar in 1/4-inch layers until you reach the surface. Scrape the surface with the edge of the trowel to level the mortar off, and then let the repairs dry overnight.

    • 6

      Sand the repair area with a sanding block containing medium-grit sandpaper until smooth. Wipe the patch clear of residue with a clean cloth.

    • 7

      Paint the patched concrete with an epoxy paint the same color as that surrounding the patched area. Use a paint roller for smooth paint application, and then allow the paint 72 hours to dry. If the paint does not blend in with the surrounding surface, paint the entire wall for color continuity.

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Wall Repairs
  1. How to Repair Rough Painted Walls
  2. How to Paint Theme Walls
  3. How to Achieve a Dragging Effect on Painted Walls
  4. Basement Wall Repair Methods
  5. How to Correct Fisheye in Painted Walls
  6. How to Neatly Paint Walls
  7. How to Repair Paint Bubbles on Walls
  8. How to Repair Cement Block Walls
  9. How to Repair a Knockdown Texture
  10. How to Repair Plasterboard Walls
  11. How to Seal Retaining Walls
  12. How to Fix Cracked Painted Walls

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