How to Fix Seam in Quartz Countertop

Having a seam in your quartz countertop can be unsightly and take away from the sleek, modern look that quartz is known for. Luckily, there are a few things you can try to fix it at home before calling in a professional.

Clean and Inspect the Seam

First, clean the area around the seam with rubbing alcohol or another mild cleaner to remove any debris or dirt. Inspect the seam closely. Is it coming apart or is there just a visible line? This will determine if you need to use an adhesive or simply hide the seam cosmetically.

Re-adhere Minor Separation with Epoxy

If there is minor separation along the seam, you may be able to re-adhere it using a two-part epoxy adhesive made for countertops. Thoroughly clean and dry the area first. Mix a small amount of epoxy and use a toothpick to work it down into the gap in the seam. Remove any excess and allow to fully cure for at least 24 hours before using the countertop. This should close small gaps.

Use Clear Caulk for Cosmetic Fix

If the quartz countertop seam is intact but just unsightly, you can use clear caulk to hide it. Clean and dry the seam area, then mask off the surrounding countertop with painter’s tape. Apply a thin, consistent bead of color-matched caulk into the seam using a caulk gun. Use a wet finger to smooth it out and remove any excess. Allow to fully cure for at least 6 hours before carefully removing the tape. This can provide a quick cosmetic improvement.

Consider Re-Polishing for Minor Scratches at Seam

Small scratches near the seam may be able to be smoothed out by re-polishing the area. Use a buffing pad attached to a variable speed polisher to gently buff the seam line in a circular motion. Work your way up from a coarser to a finer grit sanding pad. This takes off a thin layer to reveal fresh quartz underneath. Be cautious not to over-buff or create heat buildup.

Call a Professional for Major Separation

If there are large gaps, the seam is coming apart completely, or you see any cracking in the quartz, it likely needs professional help. Don’t try to glue large sections back together yourself. Call the company that installed it or another quartz fabrication specialist to inspect and repair major damage. They have the right tools and adhesives to cut out bad sections and re-seam.

Prevent Seam Damage

To avoid seam problems in the future, use trivets and cutting boards to protect the surface, particularly near the seams. Quartz can withstand moderate heat, but prolonged exposure or very hot pots can cause damage. Also clean up any spills immediately and avoid exposing quartz to strong chemicals that could eat away at the seam adhesive.

Frequently Asked Questions about Fixing Quartz Seams

Can I use regular caulk or glue from the hardware store on my quartz countertop?

No, do not use household caulk, super glue, or any non-specialty adhesive meant for other materials. Always use epoxy or caulk specifically designed for quartz and solid surfaces. Other products likely won’t bond properly long term.

How do I match the caulk color to my quartz?

Use the leftover pieces of your quartz to take with you to the hardware store. Test color-matched caulk options on the underside of your scrap pieces to find the closest match before purchasing. Let it fully cure to ensure it dries to the proper hue.

Should I try to fix a damaged seam myself or call a pro?

Minor cosmetic issues like small gaps or scratches can likely be addressed with simple DIY methods. However, for anything beyond superficial fixes, it’s best to contact a professional to properly re-adhere or re-seam your countertop. Don’t risk further damage by attempting complex repairs yourself.

What causes the seams in quartz countertops?

Seams are necessary during fabrication and installation of full quartz slabs. To span the width of most countertops, multiple pieces have to be seamed together. The adhesive and skill of the installer impacts how visible or prone to damage seams end up.

How can I help prevent quartz seams from separating?

Avoid placing very hot items from the oven or stove directly on the seams, use trivets and cutting boards, clean up spills quickly, and limit exposure to harsh chemicals to help keep seam adhesive intact. Also have it regularly inspected and re-caulked as needed.


While seam issues in quartz countertops can be annoying, in many cases they can be successfully fixed with simple caulk, epoxy, or buffing. For minimal damage, using the right homemade techniques can restore the appearance of your countertop seams. However, for more complex repairs, don’t hesitate to call in a professional quartz fabricator. With the right process, your countertop seams can look pristine and stay structurally sound.