How to Seal Stone Backsplash


Sealing a stone backsplash is an important final step when installing or renovating a backsplash in your kitchen or bathroom. A proper sealant will protect the porous stone from stains, moisture damage, and make it easier to keep clean. There are several types of sealants to choose from, each with their own advantages. With the right prep work and application technique, you can create an effective moisture barrier on natural stone like granite, marble, travertine, limestone, and slate backsplashes. This comprehensive guide will walk you through everything you need to know about how to seal stone backsplash surfaces.

Benefits of Sealing a Stone Backsplash

Sealing a natural stone backsplash provides a number of important benefits:

  • Moisture protection – Sealant fills in porous areas on stone surfaces creating a moisture barrier. This prevents liquids like water, oils, and cleaning solutions from penetrating and causing stains or damage.
  • Stain prevention – By sealing the surface, you prevent stains from absorbing into the stone. Common food and beverage stains like coffee, juice, wine, and cooking oils will wipe right off the surface.
  • Easier cleaning – Sealed stone repels dirt, grime, and bacteria much more effectively. Fewer stains also means less scrubbing is required during routine cleaning.
  • Enhanced appearance – A sealant helps the stone retain its natural color vibrancy. Without a sealer, stone can appear dull over time as dirt and debris collect in pores.
  • Longevity – By protecting against moisture and stains, a sealer preserves the beauty and integrity of natural stone over years of use. Reapplications down the road also become easier.

Sealing is highly recommended for backsplashes made of softer, more porous stones like limestone, travertine, and sandstone. It’s also wise for more durable surfaces like granite, marble, and slate which still have some porosity. Annually reapplying a sealer ensures continued protection.

Selecting the Right Stone Sealant

There are a few main options when it comes to sealers for natural stone backsplashes:

Silicone Stone Sealers

Silicone-based sealers offer excellent water, oil, and stain repellency. They soak deep into porous areas, harden within the stone, and create a robust moisture barrier. Silicones provide durable protection for years when applied properly. They withstand heat well. Silicone sealers are ideal for heavily used cooking surfaces.

Acrylic Stone Sealers

Acrylic sealers provide a thin, flexible transparent layer of protection that repels water and oil-based stains. They resist wear and abrasion. Acrylics also enhance coloring and give stone a renewed look. They can be more prone to damage from heat compared to silicone sealers. Acrylics work well for most standard backsplashes.

Impregnating Sealers

Impregnators are penetrating sealers that use oils and waxes to soak into the stone pores. They stabilize and strengthen the stone to prevent staining or etching from acidic liquids. Impregnators don’t alter the natural appearance. They provide durable protection for countertops and floors in addition to backsplashes.

Urethane Sealers

Polyurethane forms a plastic-like coating on stone surfaces. This clear top layer repels moisture. Urethanes provide excellent stain protection and durability. Application can be tricky and may alter stone’s natural look if not done properly. Urethanes work for backsplashes in high traffic areas.

Always check that the sealer is formulated specifically for natural stone and the type you are sealing. Look for water-based options as solvent-based sealers can degrade certain stones.

How to Prepare Stone Backsplash for Sealing

Proper preparation is crucial before applying any sealer to achieve good results. Here are the key steps:

  • Clean – Use a pH neutral stone cleaner to wash the backsplash and remove any dirt, debris, oils, or old sealant buildup. Rinse thoroughly and allow to dry completely.
  • Repair – Inspect for any damaged areas in the stone surface and make repairs as needed with epoxy or caulk. Fill any recessed holes that may interfere with sealing.
  • Mask – Use painter’s tape to mask off nearby surfaces like walls, countertops, and cabinets. This prevents sealant dripping. Drape plastic over appliances.
  • Test – In an inconspicuous area, test the sealer to ensure it provides the desired finish and doesn’t etch or discolor the stone.

Proper prep prevents sealant bonding issues and allows maximum penetration. This directly correlates to better performance and durability.

How to Seal a Stone Backsplash

Always refer to the product instructions as techniques vary by sealer type. Here is the general sealing process:

  1. Ventilate – Open windows and turn on fans or exhaust hoods. Good airflow is key for proper curing.
  2. Apply – Pour sealer into a paint tray and use a paint pad applicator or foam roller. Apply a thin, even coat across the entire surface using overlapping strokes.
  3. Spread – Before drying, use a dry cloth to spread out and even out any running drips or uneven pooling.
  4. Cure – Allow sealer to fully cure based on manufacturer directions. This is typically 20-60 minutes. Better sealers cure slower for deeper penetration.
  5. Inspect – Look for any missed bare spots and apply an additional coat if needed, waiting for full cure between coats.
  6. Buff – Once cured, use a clean soft cloth to remove any sealant residue and buff to an even sheen.
  7. Cure Time – Avoid use for 8-12 hours. Some sealers take days to fully cure and achieve maximum stain repellency.

Always test first on a scrap piece of stone to ensure compatibility and appearance. Applying multiple thin coats often provides better performance than a single thick coating.

Tips for Properly Sealing Stone Backsplashes

Follow these tips for best results sealing your stone backsplash:

  • Only apply sealers to fully clean and dry surfaces or sealing won’t be effective.
  • Maintain sufficient airflow and ventilation as most sealers contain volatile solvents.
  • Use a foam roller or paint pad rather than a brush for a thinner and more even application.
  • Spread any drips, runs, or puddles before curing so sealer absorbs evenly into the stone.
  • Apply lighter second coats once initial coat is fully cured to build added protection.
  • Buff thoroughly after cure to remove residue and create an even finish on the stone surface.
  • Sealers may darken or enhance color of some stones. Always test first.
  • Reseal annually or biannually depending on use to maintain protection. Spot treat high use areas more frequently if needed.

Applying with care as directed by the manufacturer will provide long-lasting moisture and stain protection for stone backsplashes.

FAQs About Sealing Stone Backsplashes

What’s the best sealer for a marble backsplash in a kitchen?

For a kitchen backsplash made of marble, a silicone-based impregnating sealer is ideal. Silicone provides the best heat and stain resistance. Impregnators soak in to create a strong moisture barrier without altering the natural stone appearance.

Should I seal my polished granite backsplash?

Polished granite is less porous making sealing less crucial, but it can still benefit from a sealing. An impregnating sealer will soak in and prevent stains while maintaining the granite’s natural shine. Reapply annually.

How long does sealer last on a backsplash?

On a backsplash that gets light to moderate use, a quality impregnating or silicone sealer should last 1-2 years before needing reapplication. In busy kitchens, expect to reseal more frequently every 6-12 months.

What’s the difference between topical and penetrating sealers?

Topical sealers leave a protective coating on the stone surface while penetrating sealers soak in and fortify the stone itself. Penetrating sealers are often preferred as they don’t alter the natural appearance but still prevent staining.

Should I seal a limestone backsplash?

Limestone is very porous and staining can be a big issue making sealing highly recommended. Use a quality impregnating sealer that won’t alter the look but will strengthen the limestone and prevent moisture damage or staining.

What sheen should I use when sealing a backsplash?

For most backsplashes, a matte or satin sealer finish looks most natural and unnoticeable. Glossy sealers tend to stand out too noticeably altering the stone’s appearance. Matte or satin blends in while still providing protection.

How long after installing a backsplash should I seal it?

It’s best to wait 3-5 days after installation before sealing to allow all grout and adhesives to fully cure first. This prevents any bonding issues with the sealer absorbing effectively into the stone pores.

Can I use a countertop sealer on a backsplash?

Yes, any sealer formulated for natural stone countertops will also work great for backsplash applications. The installation surface doesn’t matter as much as using a sealer designed specifically for natural stone.

Do I need to seal around the edges of a backsplash?

It’s important to seal any exposed stone surfaces including backsplash edges or cutouts like around outlets. These edges are vulnerable to moisture damage and staining from grime buildup so full coverage sealing is needed.


Installing a quality sealer is a smart investment to protect the beauty and longevity of any natural stone backsplash. Spending the time to properly prepare the surface and carefully apply a compatible sealer specifically formulated for stone will provide long-lasting benefits preventing stains and damage. Be sure to adequately ventilate during application. Reapply sealers annually to maintain optimal moisture protection. With the right sealer properly applied, you can enjoy your stunning stone backsplash without worries of stains or etching.