Granite is the toughest material we install. You can set a hot pan straight from the stove onto it without a second thought. But it's still natural stone, and natural stone is porous, so it needs an occasional reseal to stay resistant to stains. The job itself is simple. Most homeowners can seal a granite countertop themselves in about 15 minutes with a bottle of penetrating sealer and a couple of clean rags.
Here's exactly how to do it, and how to tell when it's time.
Step 1: Run the water bead test first
Before you buy sealer, find out if you actually need it. Pour a few tablespoons of water onto a clean section of the countertop and watch it for 10 to 15 minutes.
If the water beads up into tight little domes, the seal is still doing its job and you can hold off. If it spreads out, soaks in, or darkens the stone underneath, the sealer has worn through and it's time to reapply.
Test a few different spots, especially around the sink and stove. Those areas see the most water and oil, so they tend to wear out first.
Step 2: Clean the surface thoroughly
Sealer can only bond to stone it can actually reach. Wipe the countertop down with a stone-safe cleaner and let it dry completely before you start. Skip anything acidic, vinegar and citrus cleaners can etch granite over time. Any grease, soap film, or crumbs left on the surface will trap under the sealer and can leave a hazy patch once it cures.
Step 3: Apply the penetrating sealer
Work in small sections, two or three feet at a time, so you can keep track of where you've been. Apply an even coat with a clean cloth or straight from a spray bottle, following the product's label. Don't skip the edges of the slab. They're just as porous as the top and get overlooked more often.
Step 4: Let it dwell, then wipe off the excess
This is the step people rush, and it's the one that determines whether the job holds up. Give the sealer 15 to 30 minutes to soak into the stone's pores. Then, before it dries on top of the surface, wipe every trace of it off with a clean, dry microfiber cloth. Sealer left to dry on the granite instead of inside it leaves a cloudy film that's genuinely hard to remove later. Buff until the countertop looks exactly like it did before you started.
Step 5: Let it cure before you use the counter
Once you've wiped off the excess, leave the countertop alone for 24 to 48 hours. No cooking on it, no wet glasses, no cutting boards. The sealer needs that window to finish bonding inside the stone. Rushing this last step is the most common reason a fresh sealing job doesn't hold up as long as it should.
How often should you reseal granite?
For most granite slabs, once a year is a reasonable default. That's not a hard rule, though. Denser, less porous granites can sometimes go two years or more between sealings, while lighter-colored or more porous stones may need attention sooner. The water bead test from Step 1 is a better guide than a date on the calendar. Run it once or twice a year and reseal whenever the water stops beading.
Signs your granite is overdue for sealing
Beyond the water test itself, watch for:
- Water that soaks in and leaves a temporary dark spot instead of beading up
- Oil, wine, or coffee that leaves a stain instead of wiping off cleanly
- A dull, dry-looking patch around the sink or stove where the counter gets the most use
If it's been a couple of years since you last checked, don't panic, but don't put it off much longer either. The longer granite goes unsealed, the more time oils and dark liquids have to work into the stone and leave a stain that a simple resealing won't undo.
When it's more than a sealing issue
Sealing solves porosity. It doesn't fix damage that's already happened. If you're dealing with an actual crack, a chip, or a stain that's already set in and won't lift with cleaning, that's a repair question rather than a maintenance one. Our countertop repair page covers what we can typically fix and how we approach it.
DIY it, or let us handle it
Sealing granite is a job most homeowners can knock out on a Saturday afternoon, and we'd rather tell you that straight than sell you a service you don't need. That said, if you'd rather not deal with picking a sealer, timing the dwell period, or figuring out whether your particular slab even needs it, we handle resealing as part of ongoing care for granite countertops, including ones we didn't originally fabricate. Get in touch for a free estimate and we'll take a look at what your counter actually needs.
FAQ
How often should granite countertops be sealed? Most granite benefits from resealing about once a year, though denser stones can sometimes go longer and more porous ones may need it sooner. The water bead test is more reliable than a fixed schedule: if water stops beading up on the surface, it's time to reseal.
How do you know if granite needs to be resealed? Pour a few tablespoons of water on the countertop and watch it for 10 to 15 minutes. If it beads up into tight domes, the seal is still working. If it spreads out or soaks into the stone and leaves a temporary dark spot, the sealer has worn through.
Can I reseal granite myself, or do I need a professional? Most homeowners can do it themselves. It's a straightforward process of cleaning the surface, applying a penetrating sealer, wiping off the excess before it dries, and letting it cure for a day or two. If you'd rather not deal with it, we offer resealing as a service for granite we've installed and for slabs installed by others.
What happens if you don't seal a granite countertop? Skipping sealing doesn't damage the stone by itself, but it does leave the surface more vulnerable to staining. Oil, wine, coffee, and other dark liquids can work into unsealed granite and leave a mark that a simple resealing won't remove once it's set in.