How To Seal Granite? (5-Step Guide)

Last Updated On October 15, 2021


Are you wondering how to seal granite countertops? Sealing granite helps so water doesn’t penetrate. Natural stones like granite are extremely hard, but they have slight porosity that absorbs water. This guide for how to seal granite also applies to quartz countertops and marble countertops.

So, before you do seal granite, I recommend you read this quick 5-step guide to doing it right. In this ProPaintCorner.com article, we cover:

  • How to seal granite
  • Tips for buying granite sealer
  • How to apply epoxy to your kitchen countertops (a more permanent solution)

And much more! We’ve got all your stone care tips right here.

What You Need To Know About How To Seal Granite

Unlike limestone and sandstone, granite is a non-porous countertop surface. Although granite is one of the hardest rocks out there, it still slightly absorbs liquids when not sealed properly.

So how do you know if your granite countertop or furniture needs to be sealed? 

By using a simple water test. If the drops of water bead up uniformly on the surface of the granite, then it has likely been sealed already.

You may have to re-seal your granite once a year or so depending on the product you use.

Choose a penetrating sealer because it will last longer than other products.

Seal Granite With Epoxy

You can also seal granite by using a 2-part epoxy. This type of sealant is a one-time procedure, and it creates an extremely hard UV and water-resistant over the top of the granite. Although sealing granite with epoxy is a more expensive and lengthy solution, it’s worth it in the long run because you don’t have to continue resealing it with the spray every year or so. We run over the quick steps for applying epoxy to your granite towards the end of this article.

Supplies You’ll Need For How To Seal Granite 

Microfiber towel/Paper towel

Use a lint-free cloth for the ideal results when rubbing the sealant and polishes into the surface of the granite.

Household cleaner

Before you seal your granite countertops, you’ll need to clean them first. Lemon juice or a citrus-based cleaner will work just fine. 

Your granite sealing product of choice 

Websites like Amazon have great prices and fantastic selection when it comes to stone sealing products.

Simply search ‘granite sealer’ on Amazon’s search menu, and you’ll find quality stone sealer products like Granite Gold, TriNova Granite Sealer, Black Diamond Stoneworks Granite Sealer And Protector, etc. that have thousands of five-star reviews.

Spray bottle

Most granite sealer products come in a spray bottle, but if you decide to purchase in bulk quantity then you might have to go to your local grocery/hardware store and buy your own.

Etch

You may need to apply an etch to dirty stone countertops to chemically remove dark spots before sealing.

Polish

Using a polish after sealing is a great way to maintain clean granite countertops. Again, Amazon is the ideal resource when shopping for granite polish because there are so many options to choose from.

Check the quick tutorial video below to see what we’re talking about:

How to Properly Seal Granite
Read More -> How To Stain Cabinets

How To Seal Granite (5-Step Guide)

  1. Clean and dry the surface
  2. Evenly apply sealer and let sit
  3. Wipe the sealer into the granite using a microfiber towel
  4. Reseal if necessary (repeat steps two and three)
  5. Apply polish

Step 1: Clean and dry the surface

Use a household cleaner to clean the surface of the countertop, and dry it off with a microfiber towel.

Using an acid-based cleaner like bleach, orange, or lemon is fine when prepping for the sealant, but you’ll want to avoid using these after sealing the surface as they can dissolve the sealant over time.

Step 2: Evenly apply sealer and let sit

Spray a generous amount of sealer onto the entire surface of the countertop, and let it sit for the amount of time recommended on the spray bottle/product container. 

Step 3: Wipe the sealer into the granite using a microfiber towel

Now it’s time to massage the sealer into the granite, and the best way to do that is with a microfiber cloth or towel. A clean cloth of a different type of fabric will work just fine, but you’ll get the best results with microfiber.

Wipe off the excess sealer from the surface of the stone, and inspect the results after the recommended dry time. Are you applying to granite tile? Don’t worry about harming the grout, although you may want to apply some grout sealer before or after.

Step 4: Reseal if necessary (repeat steps two and three)

There may be situations where it’s best to reseal the surface again for the best results. One example would be a dry climate where the sealant seems to evaporate before it can seep into the pores of the granite.

Applying a second coat never hurts, so if you feel like you didn’t get enough coverage on the first go-round, then have at it. 

Step 5: Apply polish

Just because your granite countertop is sealed doesn’t mean that it won’t get dirty smudges on it with use, so you’ll have to keep a granite/quartz polish around the house for those times when cooking gets crazy. Homeowners with granite countertops typically apply polish or granite cleaner to their countertops once every ~month to keep them looking spectacular. 

Read More -> Applying Stain

Other Valuable Resources on How To Seal Granite

The internet is such an amazing source for finding information about DIY projects. We highly encourage you to use all resources available when planning your next project.

Are you applying epoxy to a granite slab? Here are some tips we’ve found to help you do it easier, and some steps for getting through the process. Most granite owners will likely just opt for the spray-on solution, but there’s no hurt in applying a quality brand countertop epoxy onto granite.

Step 1 -> Clean the granite surface/Dry with a microfiber cloth

Use any household cleaner to clean the surface of the granite, and dry it with a microfiber cloth.

Step 2-> Mix the epoxy

Mix the epoxy perfectly by using a scale to weigh both liquids according to the mix ratio. Mix epoxy with a hardener with a stir stick or another mechanical method. A great epoxy mixing tool would be a mud mixer; it’s that tool that you use to mix thinset when laying tile.

Step 3 -> Apply the epoxy with a paint roller

Roll the epoxy down the sides of a table first, and then cover the top with epoxy by rolling it on with a paint roller. No, you shouldn’t use a paint sprayer to apply epoxy because it will cure and seize all moving parts. 

Step 4 ->Use a plastic scraper to scrape off excess

After the epoxy is applied, it may fall with gravity to certain parts of the table, so it’s your job to even it out with a plastic scraper tool/drywall type tool. You may also need an acetone solvent to clean cured epoxy off of undesired surfaces.

Step 5 -> Sand and wet sand

Depending on how the epoxy hardens, you’ll want to first use 120-grit sandpaper to give it a semi-coarse feel to the touch. After the surface is evenly sanded to 120-grit, you could then move up to wet sanding starting with a 600-grit, and the more numbers of sandpaper you can hit in between 120-grit and 600-grit the better, but it’s not always the case 220 grit is available, etc. in some places.

Read More -> Best Step Ladders For Painting

Any Questions?

We’re here to answer all of your questions about sealing granite. Don’t forget to drop us a line on our Pro Paint Corner page.

Meet Your Pro Paint Corner Author

Ryan Nichols

Ryan Nichols

I first painted professionally in my late teens. I have painted everything from long military base walls to spraying cedar wood siding on cabins in the mountains of Utah. I am also an automotive technician with plenty of auto body and paint experience. In my spare time, I even enjoy artistic oil painting.

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Ryan Nichols

Ryan Nichols

I first painted professionally in my late teens. I have painted everything from long military base walls to spraying cedar wood siding on cabins in the mountains of Utah. I am also an automotive technician with plenty of auto body and paint experience. In my spare time, I even enjoy artistic oil painting.

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