How to Get Seams Out of a Quartz Countertop

Quartz countertops are a popular choice for many homeowners due to their durability, aesthetics, and ease of maintenance. However, one common issue that can arise is visible seams between slabs. Thankfully, there are several methods you can try to minimize or remove seams from your quartz countertops.

Use a Seam Sealer

One of the easiest ways to disguise seams is by applying a specialty seam sealer. These products are designed to fill and blend the seam so it becomes less noticeable. Pick a seam sealer in a color that matches your countertop. Apply it by working it into the seam with a putty knife. Remove any excess and let it dry completely. The seam should now appear smoother and tighter. Reapply as needed.

Sand and Polish

For more pronounced seams, you may need to sand and polish. Start by buying a medium grit sandpaper, like 200-400 grit. Lightly sand the length of the seam to smooth and round the edges. Be gentle and don’t grind too aggressively. Next, use a 2000+ grit sandpaper to further refine the seam area. Finish by polishing with a buffing compound or automotive polishing paste applied with a soft cloth. Work in a circular motion. This will blend the seam and restore the countertop’s shine.

Use a Router

For a more advanced approach, you can router the seam area. This involves using a specialty bit in a rotary tool to hollow out the seam and make it flush. Pick a custom bit that matches your countertop depth. Carefully rout both sides of the seam in smooth, even motions. Avoid rocking the router to prevent uneven spots. Maintain a steady hand. Once routed, polish the area with increasingly finer sandpaper grits before a final polish. This will leave a seamless, integrated look.

Fill with Epoxy

For a deep seam gap, you can fill it with an epoxy filler made for countertops. Mix the epoxy according to the product instructions and work it into the seam using a putty knife. Overfill slightly to account for drying shrinkage. Let cure fully then sand flush, starting with 150 grit and working up to 2000 grit before polishing. The sanded epoxy will be imperceptible.

Hydrate and Reseal

Over time, quartz can lose moisture leading to more visible seams as slabs contract. Try rehydrating the quartz by applying mineral oil or wax and letting it soak in. This may subtly expand the slabs and tighten seams. Afterwards, apply a fresh sealant like one that contains silicones to boost moisture retention. Reapply sealant every 6 months. Keeping the quartz hydrated prevents gaps from reappearing.

Care and Maintenance

To keep seams tightly closed, be sure to follow the manufacturer’s care guidelines. Use a pH neutral cleaner and avoid abrasive scrubbing. Blot spills quickly to prevent moisture penetration into seams. Trivets and cutting boards will protect from hot items or knife damage that could impact seams. Have sealant reapplied every 1-2 years by a professional.

When to Call a Professional

Some seams may require a professional fabricator to fix properly. If your attempts to improve the seam have not worked or made it worse, call the countertop company to inspect. They have specialized tools and materials to grind, fill, patch, and resurface seams. This is especially important if gaps allow moisture inside, risking damage. They can advise if total seam replacement is needed in severe cases.

Getting rid of pesky visible seams in quartz countertops is very achievable with the right techniques. Try a few options to see which works best for your countertop’s seam issue. With some patience and effort, you can restore the flawless, smooth look of your beautiful quartz countertop surface.

Frequently Asked Questions

What are some common causes of seams in quartz countertops?

Some typical causes of pronounced seams include:

  • Minor imperfections during fabrication and installation
  • Settling of cabinets/substructures that quartz is attached to
  • Contraction of the quartz from loss of moisture over time
  • Damage from impact, excessive heat, or other causes

Can seams reappear after being fixed?

It’s possible for seam gaps to return even after being filled, sanded, or otherwise improved. This is often due to ongoing moisture loss or instability in the support structures. Keeping the quartz hydrated with mineral oil and maintaining sealants can help prevent recurring seams.

How can I prevent seams from forming?

To minimize seam formation from the start:

  • Have an experienced fabricator template and install the countertop
  • Ensure adequate support underneath to prevent sinkage and separation
  • Follow manufacturer advice on cleaning, use, and sealants
  • Avoid exposing quartz to excessive heat or impact

Should I use a certain quartz color to hide seams better?

Solid darker colors like blacks, browns, and navy blues can conceal seams better than light colors or bold patterns. Neutral tones like grays, tans, and whites can also diminish the visibility of seams compared to bright colors.

Is there a difference between quartz seam repair vs granite or other natural stones?

Quartz can be easier to repair seams on than natural stone because of its more uniform composition. However, the same techniques of sanding, polishing, routing, or filling can be used on granite, marble, etc. Always consult a professional when working with high-end natural stone.

When do I need a professional vs DIY quartz seam repairs?

Minor seam fixes like applying seam sealer or polishing can be DIY. But extensive seaming, epoxy filling, routing, regrinding, or replacement should be done by a trained fabricator/installer. If DIY attempts worsen seams or cause other damage, call a professional immediately.


Visible seams in quartz countertops can detract from their appearance and be a nuisance. Thankfully, there are many techniques available to reduce the noticeability of seams, ranging from simple sanding and polishing to more advanced router work and epoxy filling. Keeping your quartz countertop properly sealed and maintained can also prevent seams from reopening over time. With some effort and patience using the right approach for your seam issue, you can restore the original flawless look of your quartz countertop.