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Rocks are strong and dense. They’re shaped by water over a long period of time, but your rock countertops should be fine, right?

The truth comes as a surprise to many. As How Stuff Works explains, “By its nature, granite is moisture-resistant — however, it’s also porous.” And granite is just one example — there are countless surfaces in your home that are all porous. This means that liquids can seep into them and cause discoloration, or even damage in some instances.

The Groutsmith is happy to provide granite sealing for homes and businesses in Okaloosa, Walton, and Bay counties. Take a look at what materials in your home are porous, and contact us with any questions you have about protecting them!


We’ll dive into porous materials in a moment, but first, we want to talk about what liquids can make an impact.

  • Colored liquids such as red wine or juice can be absorbed by porous materials and cause stains.
  • Many are surprised to learn that pizza grease can even be absorbed by porous materials. We’ve all seen it seep through the bottom of a pizza box; when granite or other materials aren’t sealed, it can discolor them.
  • Cooking oil and fat in general are all things that can also cause discoloration.

You don’t have to avoid granite or other porous materials in order to avoid stains. All you have to do is seal them, or hire The Groutsmith to do the granite sealing for you!


Here are some of the most common porous materials in your home — but in case you have a different type of material and are suspecting its porous, there’s a simple test you can do that we’ll dive into.


Granite is one of the most durable materials — in fact, granite countertops can usually outlive the building or house in which they’re found! However, this natural stone is very porous, and the issue isn’t just stains. In some instances, because the water or other liquid seeps into the stone and gets trapped, it can end up leading to mold. Because it’s in the rock, it’s very tricky to get rid of (also, mold is a health hazard that needs to be dealt with safely).

Granite sealing is your best solution for preventing discoloration. While it’s relatively easy to do yourself, many people opt to work with companies like The Groutsmith who have professional materials and years of experience to get the job done. Feel free to check out our granite sealing page for more information, or to give us a call!


Marble is less porous than granite, and it’s pretty resilient to liquids as a whole. However, it’s important that any spills be wiped up ASAP in order to prevent stains — the liquids can seep in over time if left unattended.

On an unrelated (but important) note, marble doesn’t react well with acidic liquids or substances. Vinegar, citrus, ketchup (the acid from tomatoes), and even mustard can all etch away marble’s sleek and natural shine.


Limestone is perhaps one of the most susceptible materials to staining and discoloration. As a sedimentary rock with a high concentration of calcium carbonate, it’s similar to marble in that it doesn’t react well with acidic materials.

Limestone is still a good option for countertops, but it requires sealing. There’s a good chance that your countertop could be permanently damaged if not sealed correctly (or at all), ruining this otherwise beautiful investment.


Think you have a material in your home that’s not listed above, but is still porous? There’s an easy way to find out. Pour a little bit of water onto your countertops (in a spot where it can’t roll off the side and onto the floor. If it’s gone in less than an hour, you’ll need to seal it. If it just sits there or is eventually evaporated, the material is not at risk for absorbing liquids.

As always, if you have a question about the porous (or nonporous) materials in your home, we’d be more than happy to answer! We provide professional granite sealing and other groutsmith services that can ensure your home continues to look beautiful and well-maintained. Contact The Groutsmith in Northwest Florida to set up a consultation!