How to Fix Cracks on Quartz Countertops

Quartz countertops are popular choices for kitchens and bathrooms because of their durability, low maintenance, and stylish appearance. However, like any solid surface, quartz can develop cracks over time. The good news is that most quartz cracks and chips can be repaired fairly easily. Here is a step-by-step guide on how to fix cracks on quartz countertops.

Assessing the Crack

The first step is to inspect the crack and determine the severity of the damage. Small hairline cracks or minor chips on the edge can often be fixed with a simple DIY repair kit. However, larger cracks that span the surface or cracks near seams will require professional repair.

Consider the following when assessing a quartz countertop crack:

  • Size – Measure the length and width of the crack. Small chips less than 1/4 inch can usually be repaired at home. Cracks wider than 2 inches likely require pro repair.
  • Location – Cracks near seams, corners, or cutouts have a higher chance of spreading and should be evaluated by a pro.
  • Depth – Check if the crack penetrates deep into the slab. Surface-level cracks are the easiest to repair.
  • Cause – Did the crack occur from impact or improper installation? Understanding the cause can prevent future cracks.
  • Aesthetics – Will the repair blend into the pattern and color or will the crack remain visible? This may influence your repair approach.

Knowing these factors will determine whether a DIY kit or professional repair is the best solution.

Cleaning and Prepping the Surface

Before repairing the crack, thoroughly clean the area with nonabrasive soap and water. Remove any debris or residue from the crack.

Use 220-400 grit sandpaper to lightly scuff the surface about 2 inches around the crack. This helps the adhesive bond better. Wipe away any dust with a dry cloth.

Applying the Adhesive

Read all instructions before using a DIY quartz crack repair kit. Different adhesives will have specific directions to follow. Here are some general steps:

  • Squeeze the adhesive directly into the crack and spread it slightly with a putty knife. Apply a thin layer just covering the crack.
  • For chips, fill the missing section a bit above the surface level to account for drying.
  • Push the adhesive deep into the crack with a putty knife to fill it completely. Remove any excess.
  • Cure times vary, but most adhesives need 24 hours before sanding and polishing.
  • Keep the area free of water and debris as the adhesive dries. Follow curing instructions.

Sanding and Polishing

Once fully cured, use 220 grit sandpaper to smooth the adhesive down flush with the countertop surface. Be careful not to scratch the surrounding quartz.

Move up to 400, 800, and finally 3000 grit sandpaper, following the contour of the countertop as you sand. Wipe away dust between sanding sessions.

Apply a polish cream with a soft cloth and buff the sanded area to restore shine. Clean away all polish residue. The repair should now blend seamlessly with the countertop!

When to Call a Professional

While small cracks and chips can be fixed with a simple DIY approach, some quartz countertop cracks require professional help:

  • Cracks wider than 2 inches or spanning seam joints
  • Deep cracks exposing the substrate below the quartz
  • Repetitive cracks that keep splitting open
  • Cracks near cutouts or corners putting the structural integrity at risk
  • When the color/pattern will be impossible to match after repair
  • If the crack worsens after attempting DIY repair
  • For cracks on floors or commercial applications where strength is critical

Quartz repair professionals have specialized tools, adhesives, and training to repair more complex cracks and prevent further damage.

Preventing Future Cracks

To help minimize quartz cracks in the future:

  • Always use a cutting board and avoid direct knife contact on the surface
  • Don’t place excessively hot items like pots and pans directly on the quartz
  • Clean spills promptly to avoid prolonged moisture exposure
  • Avoid putting excessive weight or impact on the countertop edges
  • Address swelling or shifting substrate below the quartz that can cause cracks
  • Consider a quartz sealer to improve stain and scratch resistance

With proper care and routine maintenance, it is possible to enjoy beautiful, crack-free quartz countertops for years. Learning how to fix quartz cracks with DIY kits or professional repair will keep your countertops looking pristine.

Frequently Asked Questions About Fixing Cracks in Quartz Countertops

Can I repair a crack in my quartz countertop myself?

Small hairline cracks, chips on the corners, and surface scratches can often be repaired with a DIY quartz repair kit purchased online or at a hardware store. But larger cracks wider than 2 inches or cracks near seams will require a professional.

What is the best adhesive for quartz countertop crack repair?

Look for adhesives specifically designed for quartz and solid surface repairs. Most contain epoxy resins or methyl methacrylate. Purchase through reputable brands to ensure quality and durability.

Should the adhesive color match the quartz?

Matching the adhesive color is ideal but not critical if the crack will be sanded and polished smooth. Transparent or domed adhesives allow color matching. But even opaque white adhesives can blend well once the repair is polished.

Can cracks reappear after repairing quartz?

It is possible for cracks to reappear if the underlying cause of the cracking has not been addressed. Things like inadequate substrate support, shifting cabinets, excessive impact in one area, and poor seam installation can lead to recurrent cracks after repair.

Is a quartz countertop with a crack still safe to use?

In most cases, moderate cracks and chips on quartz countertops pose no safety hazards and will not affect the function. But deep cracks or multiple cracks clustered together can undermine structural integrity. When in doubt, contact a professional.


Cracks and chips on quartz surfaces are unsightly but repairable in most cases. With the right adhesive and repair technique, you can often fix quartz cracks affordably with a DIY approach. But some situations do warrant contacting a professional quartz fabricator for a seamless repair, especially when structural integrity is compromised. With the help of this guide, you can now assess quartz damage and confidently repair cracks to restore the flawless look of your countertops.