How to Repair Crack in Quartz Countertop

Quartz countertops are popular in modern kitchens for their durability, aesthetics, and low maintenance. However, like any solid surface, they can develop cracks over time. The good news is that minor cracks in quartz can often be repaired without replacing the entire countertop. Here is a step-by-step guide on how to repair a crack in a quartz countertop.

Assessing the Crack

The first step is to examine the crack and determine if it is repairable or if replacement is needed.

  • Minor hairline cracks less than 1 mm wide can usually be repaired.
  • Larger cracks or those with missing pieces or damage underneath may require professional repair or countertop replacement.

Consider the location and extent of the damage. Cracks near sinks or extending across large sections are more problematic.

Cleaning and Preparing the Area

Thoroughly clean the area around the crack with soap and water to remove any dirt, grime or residues. This allows for proper adhesion of the repair products.

Use a vacuum cleaner to remove any loose quartz pieces or debris from the crack. Wipe the area with denatured alcohol on a clean cloth to remove any remaining oils or soap film.

Filling the Crack

There are several products made specifically for repairing and filling cracks and chips in quartz:

  • Quartz repair kits – These contain colored epoxy resins to match the quartz along with tools for filling cracks. Ensure the color matches the countertop.
  • Clear resin – A transparent epoxy or adhesive can also be used for small hairline cracks.
  • Cyanoacrylate glue – Super glue can bind pieces together quickly. Use for minor cracks or chips.

Apply the adhesive resin or epoxy carefully according to the product instructions. Thoroughly fill the crack, allowing it to seep down into the damaged section. Remove any excess adhesive before it dries using a plastic scraper or putty knife.

Smoothing and Finishing the Repair

Once the filler has cured, sand the area gently with fine grit sandpaper to smooth it flat and even with the surrounding countertop.

Use a damp cloth to remove any dust. Buff with a polishing compound or mineral oil to blend the repaired section with the surface finish.

If needed, reapply a thin layer of resin or epoxy to build up the filled area flush with the countertop. Allow to fully cure before polishing again.

Preventing Future Cracks

To help prevent cracks from forming again:

  • Use a cutting board rather than cutting directly on the quartz.
  • Don’t place excessively hot pots or pans directly on the surface.
  • Clean spills promptly to avoid moisture seeping into cracks.
  • Avoid applying excessive force or pressure on the countertop.
  • Consider a professional quartz sealer to strengthen the surface.

With proper care and timely repairs, minor cracks and chips in quartz countertops can be fixed to restore your countertop’s appearance and integrity. Contact a countertop professional if the damage exceeds DIY repair capabilities.

FAQs About Repairing Quartz Countertop Cracks

How much does it cost to repair a crack in a quartz countertop?

Minor crack repairs with a DIY quartz repair kit cost $50 or less. Complex crack repairs by a pro range from $200-$500 depending on severity. Full quartz countertop replacement costs $2,000-$5,000.

Can you repair a quartz countertop yourself?

Small chips and hairline cracks can be repaired yourself with a quartz repair kit. Larger cracks or structural damage require a professional fabricator. DIY repairs won’t match seamlessly but are less noticeable.

What is the best adhesive for quartz countertop repairs?

Specialty quartz repair epoxy with colored resin to match the surface provides the most seamless, long-lasting fill and finish. Clear adhesives like super glue work for minor flaws.

How long does quartz countertop repair adhesive take to cure?

Cure times vary by product but are generally 6-12 hours for the adhesive to fully harden and 24-48 hours to achieve maximum strength. Avoid direct pressure on the repair for at least 24 hours.

Can you use automotive epoxy to repair quartz?

It’s not recommended as auto epoxy isn’t formulated for quartz and may yellow or stain over time. Use a specialty quartz epoxy kit for the right adhesive properties and color match.

What causes cracks in quartz countertops?

Heat damage, impact, shifting cabinets, inadequate support, and incorrect installation are common causes of cracks. Manufacturing flaws and aging also play a role.


Cracks and chips in quartz countertops can often be repaired successfully without requiring full replacement. For minor flaws, DIY kits provide an affordable repair option to restore the appearance and integrity of the surface. Pay attention to properly cleaning, filling, smoothing and finishing the crack for optimal results. Seek professional assistance for more complex quartz countertop repairs beyond cosmetic flaws. With proper care and maintenance, quartz provides a durable and long-lasting countertop surface.