How to Fix Hairline Crack in Quartz Countertop

Quartz countertops are popular choices for kitchens and bathrooms due to their durability, aesthetics, and low maintenance. However, like any material, quartz can develop cracks over time. Small hairline cracks may appear on your quartz countertop surface. Don’t panic – these cracks can often be repaired fairly easily. Here is a step-by-step guide on how to fix hairline cracks in quartz countertops.

Assessing the Crack

Before attempting to fix the crack, take time to properly assess it. Here are some tips:

  • Look closely at the length and width of the crack. Hairline cracks are very narrow in width. Measure across the crack to get an idea of its width.
  • Determine if the crack is superficial or if it goes deeper into the quartz. Try gently pressing on either side of the crack to see if it moves or widens at all.
  • Check if the crack extends across the full top or just a portion of it. Cracks across the entire top are more problematic.
  • See if the crack runs into any seams or joints in the quartz. Cracks at seams can allow moisture inside.
  • Assess if the crack has caused any lippage or height difference between quartz pieces.

Thoroughly understanding the specifics of the crack will determine the repair method.

Cleaning the Crack

Before repairing, clean out the crack of any dirt or debris. This helps the adhesive bind better. Follow these steps:

  • Use a soft brush or toothbrush to lightly brush out any dirt in the crack.
  • Mix a bit of mild soap with warm water and gently wipe and rinse over the crack with a soft cloth.
  • Allow the crack to completely dry before attempting to fix it.

Applying Adhesive Repair

For hairline cracks, a specialty quartz countertop adhesive is often the best and easiest repair method. Here is how to use adhesive:

Select the Right Adhesive

Use an adhesive specifically designed for quartz repairs, such as a methacrylate adhesive. Avoid multi-purpose glues. Ask at your local hardware or home improvement store for recommendations.

Prepare the Adhesive

Follow all label instructions for preparation. Different adhesives require mixing two components together in specific ratios. Ensure proper mixing.

Fill the Crack

Use a plastic applicator or toothpick to transfer the adhesive into the crack. Fill the crack fully and remove any excess adhesive.

Allow Time to Cure

It is critical to let the adhesive cure fully, which can take up to 24 hours. Do not disturb or put any pressure on the repair until completely set.

Using Epoxy

Two-part epoxy adhesives are another option for repairing hairline cracks. Follow similar steps:

  • Select an epoxy designed for quartz or solid surface repairs. Hardware stores will have options.
  • Mix the epoxy resin and hardener according to package directions.
  • Work the mixed epoxy down into the crack, remove any excess.
  • Allow a full 24 hours for the epoxy to cure before using the countertop.

Preventing Cracks

To help prevent hairline cracks from forming in quartz countertops:

  • Always use a cutting board for food preparation. Never cut directly on the quartz.
  • Don’t place excessively hot pots or pans directly on the surface. Use trivets and hot pads.
  • Clean spills quickly to prevent moisture seeping into seams or cracks.
  • Avoid sitting or standing on quartz countertops which can stress the material.
  • Have sufficient support below quartz tops and follow manufacturer guidelines.

When to Call a Professional

If the crack is very wide, deep, or extends across seams and joints, it is likely best to call in a professional quartz repair and installation specialist. They have specialized tools and methods for repairing more complex cracks and damage.


Hairline cracks in quartz countertops can often be fixed with simple adhesive or epoxy repairs. Clean and properly assess the crack, select the right adhesive, fill the crack, and allow proper curing time. Prevent future cracks by avoiding direct impact and excessive heat on the quartz. Call a professional for complex repairs beyond hairline cracks. With some basic DIY techniques, minor hairline cracks can be fixed to keep your quartz countertop looking flawless.