Granite is a stunning, durable natural stone, but it is also porous. Without a high-quality protective sealer, your countertops can absorb spills—like oils, wine, or citrus juices—which can lead to permanent staining. Sealing your granite is the most important maintenance step you can take to preserve its beauty and integrity for years to come.
At JRL Granite & Marble, we want your surfaces to look as pristine as the day they were installed. Here is our expert guide to protecting your investment.
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To seal your granite, start with the water test: if water darkens the stone rather than beading on top, it’s time to seal. Thoroughly clean and dry your countertops, apply a high-quality penetrating stone sealer in thin, even layers, let it absorb for 10–20 minutes, and buff off all excess residue before it dries. Allow the sealer to cure for 24–48 hours before returning to heavy use. Never use harsh cleaners like bleach or vinegar, as they will strip the sealer prematurely.
Why Granite Countertops Need Sealing
Because granite is a natural stone, it contains microscopic pores. If left unsealed, these pores act like a sponge for liquids. A professional-grade penetrating sealer fills these microscopic voids, creating a barrier that prevents stains from sinking deep into the stone, while still allowing the granite to “breathe.”
How to Know If Your Granite Needs to Be Sealed
The Water Test
This is the most reliable way to check your seal:
- Pour a small amount of water (about a tablespoon) onto different areas of your countertop, especially high-use zones.
- Wait 15–30 minutes.
- If the water beads up: Your sealer is still working.
- If the water darkens the stone: The water has been absorbed, and it is time to reseal.
Signs of Worn Sealer
- Persistent stains: Water, oil, or food spots that leave a mark even after wiping.
- Dullness: The stone looks “thirsty” or chalky in high-traffic areas.
- Slow evaporation: Water spilled on the surface seems to “sink in” rather than sitting on top.
What You Need Before Sealing
- Penetrating Granite Sealer: Choose a high-quality product specifically for natural stone.
- Clean Microfiber Cloths: You’ll need several—one for applying and several for buffing.
- Mild Dish Soap and Warm Water: For the initial deep clean.
- Painter’s Tape (Optional): To protect adjacent backsplashes or fixtures.
- Gloves: Recommended for handling chemical sealants.
Step-by-Step Granite Sealing Process
- Clean and Dry: Start with a spotless surface. Use mild soap and water to remove all oils and debris. Crucial: Let the stone dry completely for at least 24 hours. Any trapped moisture can cause cloudiness or sealer failure.
- Apply Sealer Evenly: Pour a small amount of sealer onto the granite or a foam applicator. Work in manageable 2-foot sections. Spread it in thin, uniform coats using overlapping circular motions.
- Let It Absorb: Allow the sealer to “dwell” for the time specified on the bottle (usually 10–20 minutes). The surface should remain damp throughout this time; if it starts to dry in spots, add a little more.
- Buff and Cure: This is the most important step. Wipe away all excess sealer with a clean, dry microfiber cloth. If you leave excess product to dry on the surface, it will create a sticky, hazy residue. Let the stone cure for 24–48 hours without heavy use or water contact.
How Often Should Granite Be Sealed?
There is no “one-size-fits-all” schedule. It depends on the porosity of your specific stone and how heavily you use your kitchen:
- Light use: Every 2–3 years.
- Moderate use: Every 1–2 years.
- Heavy use/Light-colored stone: Every 6–12 months.
- Annual check: Perform the water test once a year to gauge your needs.
Common Granite Sealing Mistakes to Avoid
- Over-sealing: Applying too much sealer or failing to wipe away the excess creates a cloudy film.
- Sealing over dirt: You’ll lock in oils and debris, leading to permanent discoloration.
- Using the wrong cleaner: Avoid vinegar, lemon, or bleach. These are acidic or harsh and will “eat” your sealer within weeks.
- Not waiting for the cure: Returning to heavy use too soon can break the bond of the sealer before it has hardened.
Need a professional touch? If you have stains that won’t go away, or if you’re unsure about which sealer is best for your specific granite type, the experts at JRL Granite & Marble are here to help. Improper sealing can be difficult to fix—let us get it right the first time.
Contact JRL Granite & Marble for professional care!
FAQ
- How do I know if my granite countertop needs sealing? Perform the “water test”: if the water darkens the stone after 15–20 minutes, it is time to reseal.
- Can I seal granite countertops myself? Yes, it is a straightforward process if you clean the surface thoroughly and follow the dwell times and buffing instructions carefully.
- How long after sealing granite can I use it? Avoid any water or food contact for at least 24 hours, and ideally wait 48 hours for a full cure.
- What happens if granite is not sealed? It becomes porous and susceptible to staining from everyday liquids like coffee, wine, and oils, which can permanently mar the stone’s appearance.