Before you try anything: always speak to a professional before cleaning, treating or applying any product to your stone. Every slab is different, and the wrong product can cause permanent damage. Contact us or a qualified stone restorer first.
Quick answer
Small chips in concrete are filled with a colour-matched cementitious or epoxy repair compound, left to cure, then shaved flush and polished. For visible edges and anything larger than a fingernail, a professional repair is much harder to spot. Cracks should always be assessed first.
First, check what you are dealing with
- Small piece missing from an edge or corner: chip.
- Line running across the surface: crack. Have it assessed.
- Hollow sound or movement: possible structural issue.
What you need
- Colour-matched filler or repair kit
- Masking tape
- Single-edge razor blade
- Isopropyl alcohol for cleaning
Step by step
Clean the chip
Clean with isopropyl alcohol and let it dry completely.
Mask around it
Tape around the chip to protect the surrounding surface.
Fill slightly proud
Mix the colour-matched filler and fill the chip slightly higher than the surface.
Cure and shave flush
Once cured, shave the excess flush with a razor blade held flat.
Finish
Polish the repair to match, or have a restorer finish it. A concrete benchtop specialist can re-hone and refinish the surface and patch chips.
What not to use on concrete
- Superglue on visible areas: it yellows and does not match.
- Filling a crack without knowing why it cracked.
When to call a professional
Get a professional for sink cut-outs, visible edges, anything larger than a fingernail and any crack. A concrete benchtop specialist can re-hone and refinish the surface and patch chips.
Understanding chips and cracks on concrete
On concrete, damage shows as pale etch marks, darker stains, worn patches in the coating and hairline cracks.
A concrete benchtop specialist can re-hone and refinish the surface and patch chips.
Good to know
Concrete edges chip on impact. A cementitious patch can match the colour closely once refinished.
Stop it happening again
Whether yours is cast-in-place and precast concrete benchtops, repairing it fixes today's mark; protecting it stops the next one. Our clear Stone Protection Film sits over the surface, so acids cannot etch it and liquids cannot soak in. Choose Gloss for polished concrete or Matte/Satin for honed and matte finishes. The protection is identical. It is installed across Sydney with a 10-year written warranty. It will not stop a heavy knock from chipping an edge, but it protects everything else.
How we protect concrete · Choosing benchtops · Chips & cracks on every surface