How to Fix Cracked Quartz Countertops

Quartz countertops are popular in many modern kitchens and bathrooms due to their durability, scratch-resistance, and variety of color and pattern options. However, like any solid surface, quartz can develop cracks over time. Thankfully, it is possible to repair cracked quartz countertops in many cases. Here is a comprehensive guide on how to fix cracked quartz countertops.

Assessing the Damage

The first step is to assess the severity and extent of the cracking. Small hairline cracks may be able to be repaired, while larger cracks that span the full thickness of the countertop may require a full replacement.

Things to check:

  • Location of the crack – Along an edge or seam? In the middle of the countertop? Near an integrated sink?
  • Length and width of the crack – Small hairlines or major cracks?
  • Depth of the crack – Surface only or full thickness?
  • Cause of cracking – Impact, improper installation, natural settling?

This assessment will help determine whether an DIY repair is possible or if professional help is needed.

Cleaning and Prepping the Area

For small repairable cracks, thoroughly clean the area around the crack using denatured alcohol to remove any dirt, oil or debris. This will allow the adhesive to bond properly.

Sand the surface about 1 inch around the crack with 120-150 grit sandpaper to rough up the area. Vacuum away all dust.

Applying Adhesive Filler

For hairline cracks, a clear adhesive like super glue can be squeezed into the crack and allowed to dry. Apply activator spray to cure it rapidly.

For wider cracks, use a product specifically designed for solid surface repairs, such as a two-part adhesive filler kit. Mix a small amount according to package directions and use a putty knife to press the adhesive firmly into the crack. Remove any excess.

Allow the adhesive to cure fully, which can take up to 24 hours.

Sanding and Polishing

Once cured, use 120-150 grit sandpaper to smooth and level the repaired area. Be careful not to sand too aggressively.

Progress through finer 220 to 400 grit sandpapers until the repair is flush with the surrounding countertop.

Finally, use a polishing compound and buffing pad to restore the high-gloss finish of the quartz. Clean the area well when finished polishing.

Resealing and Preventing Future Cracks

To help prevent cracks from worsening or new ones forming, consider resealing the countertop every 1-2 years. Clean the surface thoroughly and apply a penetrating sealer made for quartz.

Preventative steps can also be taken:

  • Use a cutting board rather than cutting directly on the quartz
  • Don’t place excessively hot pans directly on the surface
  • Attach any undermount sinks properly to minimize natural settling cracks
  • Address any underlying support or foundation issues

With proper care and sealing, cracks in quartz countertops can often be repaired successfully. But if cracks are too large or extensive, a countertop replacement may be necessary. Consulting a countertop installation pro can also be helpful for assessing damage or trying more advanced crack repairs.

FAQ About Fixing Cracked Quartz Countertops

What’s the easiest way to fix a small crack in a quartz countertop?

For a hairline crack, using super glue or another household adhesive according to directions is likely the easiest repair method. Just ensure the area is clean before applying.

Can you use epoxy to fix a cracked quartz countertop?

Yes, two-part epoxy specially formulated for solid surface repairs works well. Make sure to follow all directions for mixing and curing the epoxy. Applying masking tape along the crack can help minimize overflow and cleanup.

What color adhesive filler should I use for a quartz countertop repair?

Use a clear, colorless adhesive filler. This will allow the filler to blend in seamlessly once cured and sanded/polished. Tinted fillers are more noticeable.

Is it possible to do quartz crack repairs yourself or do you need a pro?

Small hairline cracks can definitely be repaired yourself following the proper steps. But larger cracks or cracks near edges or seams may require a professional fabrication/installation specialist for the best results.

Can cracked quartz countertops be repaired permanently or will cracks reappear?

If repaired properly, the cracks can be repaired permanently. But improper installation or inadequate structural support under the countertop could lead to cracks reappearing over time. Addressing these underlying issues helps prevent future cracks.

What’s the best way to prevent cracks from forming in quartz counters?

Use cutting boards, avoid excessive heat, reseal the surface annually, and make sure undermount sinks and the countertop itself are properly supported and installed to minimize natural cracks from settling.


Cracks and chips in quartz counters are common but definitely repairable in many cases. After thoroughly assessing the damage, the key steps are proper cleaning and prep, using the right adhesive filler, and careful sanding/polishing to blend the repair. For best results, address any underlying issues causing the cracks and take steps to prevent future damage. With some patience and effort, those annoying quartz cracks can often be made like new again.