How to Fix Crack in Quartz Countertop

Quartz countertops are popular in many homes due to their durability, aesthetics, and low maintenance. However, like any solid surface, quartz can develop cracks over time. The good news is that most quartz cracks can be repaired fairly easily. Here is a comprehensive guide on how to fix cracks in quartz countertops.

Causes of Cracks in Quartz Countertops

Before learning how to fix quartz countertop cracks, it’s important to understand what causes them in the first place. Here are some of the most common reasons quartz can crack:

  • Impact damage – Dropping a heavy object on the countertop can cause impact cracks. Quartz is sturdy, but a significant impact can still damage the material.
  • Thermal shock – Exposing quartz to sudden and extreme temperature changes, like setting a hot pan on it, can cause cracks due to rapid expansion and contraction.
  • Tension forces – Any forces that pull the countertop in opposite directions can lead to tension cracks. Improper installation or settling of cabinets can create these forces.
  • Minor flaws – Small natural fissures or weak spots in the quartz material that develop into larger cracks over time.

Cleaning and Preparing the Cracked Area

Before repairing a cracked quartz countertop, you need to properly clean and prepare the area:

  • Use a shop vacuum to remove any loose debris or shards from the crack.
  • Clean the area thoroughly with soap and water to remove grease, food, and dirt. Rinse and dry completely.
  • Use a putty knife to remove any old caulk or adhesive remnants from the crack so the repair materials can bond effectively.
  • Widen the crack slightly using a rotary tool to create a “V” shape. This gives the repair compound more surface area to grip.
  • Vacuum and wipe down the area one more time once preparation is complete.

Repairing the Crack

With the area prepped, you can begin repairing the actual quartz crack. Here are the steps:

Step 1 – Apply Adhesive in Crack

  • Squeeze adhesive specially formulated for quartz, such as Quartz Poisson, deep into the crack using the applicator tip.
  • Fill the entire crack so there are no empty spaces or air pockets.
  • Take care not to spill excess adhesive on the countertop surface.

Step 2 – Fill Crack Level with Countertop

  • Once adhesive is applied, fill the crack flush with the quartz surface using quartz putty/filler products such as Tenax Hypertch.
  • Press the filler firmly into the crack with a putty knife so it bonds with the adhesive you applied.
  • Smooth the filler perfectly level with the countertop so the repair is invisible. Allow filler to dry completely.

Step 3 – Sand and Finish Repair

  • Once filler has dried, use 150 grit sandpaper to blend and smooth the repaired area so it’s flush with the rest of the quartz.
  • Carefully sand just the filled crack, not the whole countertop. Wipe away dust with a dry cloth.
  • Apply a quartz-specific sealant like Tenax Hypertch Finish to protect the repair and give an invisible finish.

And that’s it! With the right products and techniques, you can make quartz countertop cracks virtually disappear. Be sure to take care not to bang or drop heavy objects on the area once repaired.

Tips for Preventing Future Cracks

To help avoid more cracks in your quartz countertops:

  • Always use a cutting board for food prep. Never cut directly on the quartz.
  • Don’t place extremely hot pots or pans directly on the surface. Use trivets and hot pads.
  • Clean spills quickly to prevent moisture damage. Thoroughly dry the area.
  • Avoid exposing quartz to sudden temperature extremes.
  • Handle heavy objects carefully around the counters. Never drop them on the surface.
  • Have countertops professionally installed to prevent tension cracks.

FAQs About Fixing Quartz Countertop Cracks

Can I use regular adhesive to fix a quartz crack?

No, it’s important to use a specialized quartz adhesive made for solid surfaces. Normal glue or caulk does not bond properly long-term.

What color filler should I use to match my quartz?

Use a filler that matches your specific quartz color and pattern. The Tenax Hypertch filler comes in different color options.

Is it possible to repair a quartz crack myself?

Yes, with the right materials and steps, homeowners can absolutely repair quartz cracks themselves. The process is very doable as a DIY project.

Can any repairs be seen after fixing a crack?

With a properly smoothed and sanded repair, the crack should be practically invisible and undetectable. The key is blending the filler flush with the surrounding quartz.

What’s the best way to smooth and finish the repair?

Gently sanding with 150 grit sandpaper helps blend and polish the filled area level with the countertop. Wiping dust and applying a finisher protects the repair.


Cracks in quartz countertops can develop over time but don’t require full replacement. With specialty adhesive, filler, sanding, and sealant, homeowners can repair quartz cracks in just a few steps. Be sure to properly prepare the area first, fill the crack with leveling compound, sand smooth, and seal. With the right techniques and products, quartz repairs can be virtually undetectable. Handle your countertops with care and you can avoid future cracks.