Most homeowners have heard it: granite countertops need to be sealed to stay looking their best—and that’s true. Because granite is a natural stone, it can absorb liquids, leaving behind a stain if unprotected.

But here’s the catch: not every granite countertop has the same porosity, and not every kitchen needs the same schedule for sealing granite. In this article, you’ll learn why sealing matters and how to know exactly when it’s time.

If you’re still deciding between materials, this comparison on quartz vs. granite countertops can help you figure out which surface fits your kitchen best:

Why Granite Countertops Need to Be Sealed

Many homeowners assume their granite countertop is invincible, but the truth is, granite is still a natural stone surface. Even the hardest slab has tiny pores where liquids can soak in, and that’s where stains begin.

Sealing granite isn’t about changing the look of the stone. It gives it a protective layer that makes your countertop easier to live with every day.

Here’s what to know before you decide how often to seal your granite countertops:

• Granite is a natural stone surface. Most slabs are porous, which means liquids can seep in and leave behind a stain. Sealing granite creates a protective layer that keeps spills sitting on top of the stone surface long enough to be wiped away.
• Not all granite is equally porous. Darker granite slabs are usually denser, so they hold up longer before needing another coat of sealant. Lighter colors, on the other hand, often allow liquids to soak in faster, so they need to seal your granite countertops more often.
• Sealing prevents everyday damage. In a busy kitchen or bathroom, it’s not just water—it’s oil, grape juice, or even a squeeze of lemon juice that can etch or discolor the stone. A good sealant helps protect against those messes that happen even when you wipe spills immediately.

Knowing the importance of sealing is the first step. The next challenge for homeowners is figuring out whether their own countertops need to be sealed right now, and that’s where a simple test comes in.

Curious about how granite stacks up against other durable options? Here’s a breakdown of the top 5 durable kitchen countertop materials for busy kitchens.

How to Know If Your Granite Countertops Need to Be Sealed (or Resealed)

The hardest part about sealing granite counters isn’t the application. It’s knowing whether you actually need to. Some granite countertops need to be resealed every year, while others hold their protective layer much longer. Luckily, there’s a quick way to find out.

Here’s how you can check if it’s time to reseal your granite countertops:

• Perform the simple water test. Pour a small amount of water on the granite countertop. If the water beads, the stone is properly sealed. If it darkens or soaks in, it’s time to apply sealer again.
• Check once or twice a year. Many homeowners perform the water test on their counters every six months. This works whether you’re testing brand-new kitchen counters or deciding if it’s time to reseal after a few years.
• Understand sealing frequency. Most granite countertops need to be resealed every one to five years, depending on the porosity of the slab and how often spills happen. For light colors, you’ll often need to reapply more frequently than for darker stone.
• Understand the quality of your granite countertop. Not all granite is the same. A higher-quality, denser slab naturally resists liquids better and holds a protective layer longer, while softer, more porous stone surfaces may require more frequent resealing to maintain durability over time.

And while granite requires this level of care, other types of stone behave differently. Surfaces like quartz and quartzite often don’t need to use a sealer at all, which is worth considering if you’re comparing stone countertops for your home.

If you’re exploring other surfaces, check out why quartz countertops are a top choice for modern kitchens. Unlike granite, quartz doesn’t require sealing at all.

And if your project extends beyond the kitchen, here’s the ultimate guide to choosing the perfect bathroom countertop material.

Key Takeaways

Granite countertops need to be sealed but how often depends on the quality and porosity of your slab. Regular checks, like the simple water test, make it easy to know when it’s time to reseal and keep your counters protected. With proper sealing, granite stays long-lasting, stain-resistant, and beautiful.

Not sure if it’s time to seal your granite countertops? AMC Countertops not only sells premium granite and natural stone surfaces, but we also provide repairs and expert care to keep them looking their best. Visit our showroom to get started.

For more inspiration, here’s why granite countertops remain a popular choice for homeowners.

FAQs About Sealing Granite Countertops

How often do granite countertops need to be sealed?

Most granite countertops need to be resealed every one to five years, depending on the quality and porosity of the slab. A simple water test helps determine whether it’s time to seal your granite countertops again for protection.

How can I tell if my granite needs to be resealed?

Do the water test: pour a tiny amount of water on the stone surface. If it beads, the granite counter is sealed. If it darkens or absorbs, it’s time to reapply sealer. This quick check keeps sealing granite counters simple and effective.

What happens if I don’t seal granite countertops?

Without a sealant, a granite countertop can soak in spills of oil, wine, or lemon juice, leading to stains that are hard to remove. Sealing granite counters adds a protective layer that makes it easier to clean granite and maintain its polish.

Do all granite countertops need to be sealed?

Yes, though not at the same frequency. Denser, high-quality slabs may hold their protective layer longer, while more porous types of stone require resealing sooner. The key is to determine whether you need to seal with regular testing.

What’s the best way to clean granite countertops after sealing?

Use mild soap and water with a clean cloth or sponge. Avoid acidic cleaners or harsh products that strip the sealant. Wiping spills immediately and using gentle care keeps your stone surface strong and stain-resistant between resealing.