What Silicone to Use for Quartz Countertops

Installing new quartz countertops can transform the look and feel of your kitchen. With their durability, low maintenance, and customizability, quartz countertops are a popular choice for many homeowners. However, proper installation is key to ensuring your countertops last for years to come. One important decision is choosing the right silicone to use when installing quartz countertops.


When installing quartz countertops, silicone is used to seal the seams between countertop slabs and between the countertop and backsplash. Using the right silicone is crucial for a seamless look and to prevent leaks. The silicone acts as a waterproof barrier, sealing out moisture and preventing bacteria and mold growth.

So what is the best silicone to use for quartz countertops? Here’s a guide to picking the right silicone for a flawless quartz countertop installation.

Silicone Types for Quartz Countertops

100% Silicone

100% silicone is the best type of silicone to use when installing quartz countertops. 100% silicone contains only silicone polymers and will not dry out or crack over time. This gives you the most durable, long-lasting seal.

Look for 100% silicone that is non-corrosive and specifically designed for kitchen and bath applications. Avoid silicone that contains latex or other additives, as these can break down over time.


For a seamless look, choose a silicone that matches your quartz countertop color. Silicone comes in various shades of white, black, gray, and almond to blend in with your countertops.

Clear silicone can work with any color countertop but is more noticeable in the seams. Consider clear silicone for discreet areas like where the countertop meets the backsplash.

Properties to Look For

  • Mold/mildew resistant: Contains fungicides to prevent mold and mildew growth in moist areas.
  • Low-odor: Emits less obtrusive fumes during curing. Important for indoor kitchen use.
  • Non-corrosive: Will not corrode metal sinks or fixtures.
  • Flexible: Ability to expand and contract with countertops.
  • Quick curing: Faster curing means less time waiting to use your countertops.

Applying Silicone for Quartz Countertops

Once you’ve selected the right silicone, proper application is key:

  • Surfaces must be clean and dry before applying silicone.
  • Follow the product instructions for curing time before water exposure.
  • Apply in a continuous bead without gaps or air pockets.
  • Use a plastic applicator or spatula to smooth the silicone evenly.
  • Remove any excess silicone immediately with a plastic scraper and mineral spirits.
  • Allow the full stated cure time before exposing to water or heavy use.

Common Problem Areas

Pay special attention to seal these areas thoroughly with silicone:

  • Seams: Apply a thin bead of silicone along the entire length of any seams between countertop slabs.
  • Sinks: Seal the seam around drop-in and undermount sinks.
  • Faucet holes: Seal around faucet holes to prevent moisture penetration.
  • Appliances: Seal spaces between countertops and appliances like dishwashers.
  • Backsplash: Seal the joint between countertop and backsplash.

Long-Term Maintenance

With proper installation and care, quartz countertops can last for many years. To keep your countertops looking like new:

  • Avoid using harsh chemicals and abrasive cleaners on countertops.
  • Promptly clean up spills to prevent stains.
  • Re-apply silicone as needed to maintain the seal and prevent cracks.
  • Avoid excessive heat and rapid temperature changes which can damage the seal.

Choosing the Right Silicone

Installing quartz counters is a big investment, so take the time to choose the optimal silicone to protect them. Use a high-quality 100% silicone designed for kitchen and bath applications. Match the silicone color to your countertop and ensure proper application for seamless, waterproof joints that will stand the test of time. With the right silicone, you’ll enjoy beautiful, durable quartz countertops for decades.

Frequently Asked Questions About Silicone for Quartz Countertops

What are the different types of silicone to use with quartz?

The best choice is a 100% silicone designed for kitchen and bath use. Avoid latex or hybrid silicone, which can break down over time when exposed to heat and moisture.

Does silicone for quartz counters come in different colors?

Yes, silicone is available in various shades of white, brown, black, gray, and clear to blend in seamlessly with your countertops. Always match the silicone color to your quartz.

What special properties should I look for?

Seeking mold resistant, non-corrosive, flexible, and quick-curing silicone will give you the most waterproof, long-lasting seal for quartz counters.

Does silicone need time to cure before the countertops can get wet?

It’s crucial to allow the full stated curing time, usually 24-48 hours, before exposing silicone seals to water. This ensures a complete, waterproof bond.

How do I apply silicone properly when installing quartz?

Apply in a smooth, even bead without gaps, smooth with a tool, remove any excess immediately, and allow the recommended curing time before use.

How often does silicone need to be reapplied on quartz countertops?

With proper initial application, high-quality silicone should last for years. But it’s important to re-apply as needed if any cracks, gaps, or breakdown occur.

Can I use silicone seals on all areas of my quartz countertop installation?

Yes, silicone is safe and recommended for sealing all joints on quartz counters like seams, sinks, faucets, backsplashes, and appliances. Pay special attention to these areas.


Choosing the optimal silicone is a key step to ensuring your beautiful new quartz countertops maintain their sleek appearance and waterproof functionality for years. Seek out a trusted brand of 100% non-corrosive kitchen and bath silicone that matches your countertop color. Proper sealing with silicone will prevent leaks, cracks, and mold growth. With extra care taken during installation and routine maintenance, your quartz countertops will withstand the demands of your kitchen for decades to come.