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Best Natural Stone Sealer (2019): Reviews and Comparison

  • July 3, 2019
  • / By Dale Keese
Bathroom Design

Natural stones such as granite, marble, travertine, limestone, and sandstone, to name a few, are used for countertops, floors (both indoors and outdoors) and bathrooms, among others. Most of these stones are porous in nature, some more so than others. If water, oil, grease, and other contaminants are allowed to sit on the stone surface for long, it slowly seeps into the stone and creates ugly stains. It also damages the stone. Hence, most types of stone tiles and slabs require a good quality stone sealer to protect it against staining and damage.

Bathroom Design

Yes, that’s true. Contrary to popular belief, not all types of stones need to be sealed. The porosity of natural stones varies from dense to highly porous. For example, sedimentary stones such as sandstone and limestone have high levels of porosity. Sandstone can have up to 30% porosity, while limestone can have up to 20% porosity. The high level of porosity means that the molecules inside are less tightly packed, which makes these types of stones easier to work with and shape. It also means that sandstone and limestone are more vulnerable to water damage and staining.

On the other hand, slate is a much harder and significantly less porous natural stone. It has 5% porosity. Water isn’t easily absorbed by slate, if at all. This is the primary reason slate is a popular choice for roofing tiles. It’s also used for flooring.

Granite is one of the hardest natural stones and has just 1% porosity. The hardness makes it a popular flooring material choice, as well as for countertops. While granite is unlikely to absorb water, it’s still vulnerable to oil-based staining substances, especially if the substance remains standing on the granite surface for a long period of time.

Marble lies in between slate and limestone. It’s more porous than slate, but a little less porous than limestone, whereas quartz is practically non-porous.

A good quality stone sealer will protect natural stone surfaces and increase its lifespan.

Top 10 Reviews of Natural Stone Sealers

Stone Care International Granite & Stone Sealer

Stone Care International stone sealer is a professional grade sealer that protects all natural stone surfaces from potential damage caused by exposure to water and stain-producing substances. Yet the stone surface is able to breathe and release moisture vapors, which keeps it healthy. It's available in a squeeze bottle, which makes it really easy to apply.

Stone Care International Granite & Stone Sealer

Source: stonecare.com

OUR RATING

Features

  • It's a water-based penetrating sealer.
  • It offers a coverage of about 72 square feet per 24 oz and about 48 square feet per 16 oz of sealer.
  • It does not contain any harmful chemicals such as ammonia and phosphate.
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    It can be used on all types of stone surfaces, including floors, countertops, walls, decorative items, and more.

Advantages

  • It's safe to use on surfaces that come into contact with food such as kitchen countertops.
  • It does not leave any residue or marks post application.
  • It doesn’t alter the natural color of the stone in any way.

Drawbacks

  • It needs to be reapplied after 6 months for continued protection.
  • The application instructions are a bit confusing, which a number of customers have complained about.

Black Diamond Stoneworks Wet Look Stone Sealer

The Black Diamond Wet Look Stone Sealer protects natural stone surfaces and provides a glossy finish to the surfaces. It does not just provide protection against water, but also against corrosive chemical and UV rays. It also slows down the pace of natural wear and tear that the surface is subjected to. This sealer protects and beautifies natural stone surfaces in your house.

Black Diamond Stoneworks Wet Look Natural Stone Sealer

Source: bdstoneworks.com

OUR RATING

Features

  • It’s a water-based sealer that’s VOC compliant.
  • It's available in various volumes, including a 5-gallon pail and a small trial pack.
  • It can be used on a number of natural stone surfaces, including slate and sandstone.
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    One gallon of sealer delivers coverage of up to 600 square feet.
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    One quart of sealer delivers coverage of 150 to 250 square feet.
  • Stone care professionals have tested and used this sealer.

Advantages

  • While it does provide a glossy or shiny finish, it doesn't darken the stone surface or cause yellowing.
  • You can use it on stamped and decorative stone surfaces as well.
  • Any excess sealer can be easily cleaned up with water.
  • It doesn't produce a bad smell, which makes it a good choice for indoor usage.

Drawbacks

  • It can't be used on polished stone surfaces.
  • Some customers have complained that the wet look doesn’t last long and the sealer needs to be reapplied frequently.

Weiman Granite Stone Sealer

The Weiman Stone Sealer will help you enhance the natural look of the stone surface. Natural stones aren't cheap. You must have spent a lot of money installing natural stone tiles or slabs at various places in your house. A good-quality sealer, like Weiman, helps you maintain them and increase their lifespan.

Weiman Granite Stone Sealer

Source: weiman.com

OUR RATING

Features

  • This is a water-based penetrating stone sealer.
  • The sealer consists of a floral polymer that seals the stone pores through which water and other stain-producing substances seep in.
  • It prevents stains created by water, food and oil-based substances from sticking to the stone
  • surface.
  • It can be used on all solid stone surfaces, including granite, marble, quartz, travertine, sandstone, limestone, slate, and others. 
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    You can apply this sealer on stone countertops and stone floors.
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    The curing time varies between 4 to 6 hours, depending on the type of stone.
  • It's non-acidic and non-toxic.

Advantages

  • With this sealer on a stone surface, it becomes really easy to clean it.
  • It can rejuvenate old stone surfaces by making them look fresher and cleaner.
  • It delivers a clear finish.
  • It doesn't leave any streaks.

Drawbacks

  • It needs to be reapplied after every 6 to 12 months.
  • Some customers have complained that this sealer leaves a haze on dark-colored stone surfaces.

Granite Gold Sealer Spray

Granite Gold is an easy-to-apply sealer for natural stone surfaces. All you need to do is spray the sealer on the surface and wipe it off right away. This process needs to be repeated 2 to 3 times, with a gap of 20 minutes in between each application, for best results. This sealer is made by a three-generation-old family-owned business that has a long history and a lot of expertise in producing top-quality stone care products.

Granite Gold Sealer Spray

Source: granitegold.com

OUR RATING

Features

  • Granite Gold is a water-based sealer.
  • It protects stone surfaces against staining and soil build-up, as well as etching.
  • It can be used on all natural stone surfaces, including granite, marble, and travertine.
  • The curing time for this sealer is 24 hours.
  • It's non-toxic and non-acidic.
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    It's pH balanced.
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    It doesn't contain any ammonia or phosphate.
  • The sealer is biodegradable.

Advantages

  • It's completely safe to use on kitchen countertops and any other stone surfaces that come into contact with food.
  • It's an environmentally safe sealer and safe to use in areas frequented by children and pets.
  • It can be used on polished stone surfaces as well.

Drawbacks

  • The sealer needs to be reapplied after 6 to 12 months to maintain the protective layer.
  • It offers low coverage.

Stone Pro Pro Sealer Impregnating Sealer

The Stone Pro Pro Sealer is a professional-quality penetrating sealer for natural stone surfaces. The solvent used in this sealer is equipped with hybrid carrier technology that enables the sealing polymers to reach deep into the stone and provides excellent resistance to staining substances.

Stone Pro Pro Sealer Impregnating Sealer

Source: stoneproonline.com

OUR RATING

Features

  • This is a solvent-based penetrating stone sealer.
  • It can be used on granite, marble, travertine, limestone and other natural stone surfaces.
  • It provides a coverage of 100 to 300 square feet per quart. The coverage varies because the
  • porosity and texture vary from one type of natural stone to the other.
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    It takes 24 to 72 hours for it to fully cure.
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    It's non-toxic and non-flammable.
  • It’s volatile organic compounds (VOC) compliant.

Advantages

  • The natural color and appearance of the stone surface will not be altered in any way.
  • It doesn't leave a residue or streak.
  • It is safe to use on food preparation surfaces such as kitchen countertops.

Drawbacks

  • Not the ideal choice for use inside the house.
  • The level of stain resistant provided by this sealer is not as good for marble surfaces as it is for granite surfaces.

Black Diamond Granite Sealer

Black Diamond Granite Sealer is one of the best stone sealers when it comes to repelling oil-based substances and water. It provides professional-quality sealing at an affordable price. Your natural stone counters and floors will remain just like new for years to come, with this sealer. It's a high-quality stone sealer, but the process of applying it is really easy.

Even first-time users will face no problems whatsoever in applying it to their favorite natural stone surfaces in the house. Simply spray the sealer on the surface, let it dry and wipe off any excess sealer.

Black Diamond Granite Sealer

Source: bdstoneworks.com

OUR RATING

Features

  • This is a water-based penetrating stone sealer.
  • It can be applied on marble, travertine and limestone surfaces, besides granite.
  • It can also be applied on concrete, grout and brick surfaces.
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    It's the perfect sealer for floors, patios, and fireplaces.
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    The sealer cures in 2 to 5 hours.
  • It's a non-toxic and non-corrosive sealer.

Advantages

  • Since it doesn't release fumes or produce an odor, you can use it to seal indoor stone surfaces without any worries.
  • The seal repels stains but allows the stone surface to breathe.
  • It not just protects stone surfaces from grease stains, food, water, dirt, and others but also makes it easier to clean and maintain.

Drawbacks

  • It doesn't help to eliminate etch marks.
  • The effect of the sealer lasts about six months at most and needs to be reapplied after that.

The Floor Guys Stone and Grout Sealer

The Floor Guys is a well-known name in the stone care products segment. They have been producing high-quality stone sealers for a number of years now. This stone and grout sealer provides excellent protection against oil-based and water-based stains, as well as wine, juice, and others. Applying the sealer is a simple process. Spread it evenly on the surface and wipe it off after 5 minutes.

Floor Guys Grout & Granite Penetrating Sealer

Source: groutinfo.com

OUR RATING

Features

  • It's a water-based penetrating sealer, with fluoropolymer.
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    It can be used on all natural stone surfaces such as marble, slate, travertine, granite, limestone, and more.
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    It can also be used on ceramic and porcelain grout.
  • It provides coverage of 300 to 500 square feet per quart, depending on porosity of the stone.

Advantages

  • It's a good choice for indoor stone surfaces because it produces little to no odor.
  • It doesn't affect the natural look of the stone.
  • It has a long lifespan.

Drawbacks

  • If this sealer comes into contact with glass, it can create an unremovable residue. So, keep it away from glass surfaces or clean the glass with water immediately.
  • It’s an expensive sealer.

Tuff Duck Natural Stone Sealer

Rocklinite Labs' Tuff Duck Natural Stone Sealer is the preferred choice of stone care professionals in the country. It provides high-quality protection against the toughest stains. Be it oil-based stains or water-based stains, Tuff Duck prevents both from damaging porous natural stone surfaces.

Tuff Duck Natural Stone Sealer

Source: rocklinitelabs.com

OUR RATING

Features

  • It's a water-based fluoropolymer sealer.
  • It provides coverage of 160 square feet per quart.
  • The sealer lasts 3 to 5 years on indoor stone surfaces and lasts 1 to 3 years on outdoor stone surfaces.
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    It can be used to seal all types of natural stone surfaces such as granite, marble, limestone, sandstone, travertine, and others.
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    The curing time is 24 hours.
  • It's non-acidic.

Advantages

  • It doesn't affect the natural appearance or natural finish of stone surfaces.
  • It can be used on interior and exterior stone surfaces.
  • It doesn’t etch marble surfaces.

Drawbacks

  • Some customers have complained that this sealer works well for granite, but not for marble surfaces.
  • It smells quite bad during the drying/ curing phase.

Ultra Dry 70 Stone Sealer

Ultra Dry 70 from Stella Sealants is a premium quality sealer for all types of natural stones, like marble, granite, limestone, travertine, and others. It protects stone surfaces from all forms of stain-producing substances, including oil, grease, food, wine, coffee, water, and more. You can apply it using a roller brush, a paint pad, and even a low-pressure sprayer.

Ultra Dry 70 Stone Sealer

Source: stellasealants.com

OUR RATING

Features

  • This is a water-based penetrating sealer.
  • It's a breathable sealer.
  • It provides protection against saltwater as well.
  • It's good for both residential and commercial usage.
  • It can be used to seal stone surfaces inside and outside the house.
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    It protects stone surfaces from wear and tear in high traffic areas.
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    It takes 24 to 48 hours for the sealer to cure.
  • Provides up to 3,000 square feet coverage per gallon.

Advantages

  • The advanced polymers in this sealer provide protection against stains, without changing the natural finish of stone surfaces.
  • You can use it on kitchen countertops, where it can come in contact with food.
  • It's safe for children and pets too.

Drawbacks

  • It needs to be reapplied frequently to maintain the quality of the seal.
  • If the excess of the sealer isn’t cleaned properly, it leaves residual marks on the surface.

Tenax Proseal Stone Sealer

Tenax Proseal protects stone surfaces against stains caused by oil-based and water-based substances. It's a value-for-money sealer that has been extensively developed by the company. The sealer should be applied on properly cleaned and dried surfaces only, or else the quality of seal may not be up to the mark. When applied in the right way, this sealer can even rejuvenate old and weary stone surfaces.

Tenax Proseal Stone Sealer

Source: tenax4you.com

OUR RATING

Features

  • This is a solvent-based sealer.
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    It can be used on all types of stones surfaces, including granite, limestone, sandstone, and more. 
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    The coverage varies between 200 and 300 square feet per liter of Proseal sealer.
  • It usually takes about 24 hours for the sealer to be fully cured.

Advantages

  • It's really easy to apply this sealer. The entire process of applying one coat takes 15-20 minutes.
  • It can be used on marble surfaces as well, including Carrara marble surfaces.
  • It lends a clear or transparent finish.

Drawbacks

  • Make sure that the excess of the sealer is cleaned properly, or else a sticky residue might create ugly marks on the surface.
  • This sealer is classified as a hazardous material and should not be used on indoor stone surfaces.

Types of Natural Stone Sealers

Water-Based Stone Sealers

In these types of sealers, water acts as the medium that transports the sealing polymers into the stone. Any stain-producing substance enters the stone via the tiny pores in it. The sealer blocks these pores and prevents the staining substances from seeping in. It’s important that you pick a water-based sealer that blocks the pores but still allows the stone to breathe. If that’s not the case, the water will not evaporate. It will remain trapped inside and lead to mold formation.

Minimalist Kitchen Design

Solvent-Based Stone Sealers

As you might have guessed, a chemical solvent transports the sealing polymers into the stone, in place of water. Some solvent-based sealers provide a greater degree of protection against oil-based contaminants than water-based ones, which can be important for kitchen countertops and other stone surfaces that are exposed to oily and greasy substances.

One major issue with solvent-based sealers is that they tend to contain volatile organic compounds (VOCs) that evaporate out of the stone surface in the form of toxic fumes. The fumes also have an unpleasant odor. This makes solvent-based sealers less suitable for application inside the house than water-based sealers.

Both water-based and solvent-based stone sealers are available in the form of penetrating or impregnating sealers. As the name suggests, penetrating sealers are absorbed into the stone and provide comprehensive protection against water damage and stains. Plus, penetrating sealers last long. There’s another type of sealer that’s known as topical sealers. These remain at the surface level and form a thin, transparent protective film or coating.

The problem with topical sealers is that the surface becomes slippery, which can have serious consequences in case of floors. Plus, topical sealers wear out much faster than penetrating sealers, because the sealer is at the surface level. Topical sealers need to be reapplied frequently to maintain the protection, which adds up to a lot of extra expenditure. Penetrating sealers are the best stone sealers.

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Penetrating Sealers vs Topical Sealers

One of the main reasons topical sealers are still popular is that they cost less than penetrating sealers. Price is an important factor, whether we like it or not. If you need to stick to a budget, then topical sealers might be your best bet. However, do keep in mind that topical sealers need to be reapplied more frequently. It might just make more economic sense to go for a penetrating sealer than a topical sealer. Topical sealers are also much easier to apply than penetrating sealers.

For a first-time user or someone just not used to this, a topical sealer might be a better option. Slip-resistant topical sealers are available as well. Scratches and scuff marks are clearly visible on topical sealers, which can look ugly. You will have to regular buff the surface or re-apply the sealer, which subjects the stone to undue stress and can lead to damage. Low-quality topical sealers are also known to turn yellow. Topical sealers can also prevent the stone from breathing, resulting in moisture getting trapped and eventually spalling.

Penetrating sealers provide a greater degree of protection and last longer. Some penetrating sealers can last up to 5 years. Manufacturers recommend that sealers should be reapplied annually, but that’s primarily a marketing tactic. Penetrating sealers are more expensive and require a little more effort to apply. It might be difficult for a complete novice to apply it properly, though it’s not impossible.

Choosing the Right Stone Sealer

You will have to take into consideration a couple of factors while selecting the right stone sealer.

Courtyard
  1. 1
    Is the sealer for an indoor stone surface or outdoor stone surface? 
    Indoor surfaces and outdoor surfaces both have their own set of challenges. Indoor surfaces are more likely to be exposed to oil, wine, coffee, food, acidic substances, etc. Whereas, outdoor surfaces are more likely to be heavy traffic zones and subjected to greater wear and tear. You can’t use a sealer that has toxic elements inside the house, especially on food prep surfaces like kitchen countertops. The same isn’t an issue for outdoor stone surfaces.
  2. 2
    Do you want a clear finish or an enhanced finish?
    A clear finish sealer will ensure that the natural look or appearance of the stone is retained. The sealed surface will look cleaner and brighter, but the natural color of the stone will remain unaltered. On the other hand, an enhanced finish sealer can darken the color of the stone or make it more shiny/glossy or both. These sealers are also known as wet-look sealers. When something is wet, it becomes a couple of shades darker. These sealers have the same effect on stone. The choice is completely a personal preference, but a wet-look sealer doesn’t make sense for marble surfaces or any polished stone for that matter.
Bedroom

Key Features of the Best Stone Sealers

  • The molecular structure of the best stone sealer must be small, which will allow it to penetrate deep enough into the stone and create a bond. The strength of this bond will determine how effective the sealer is in preventing stains.
  • At the same time, a good quality stone sealer should also be able to resist the chemicals in cleaning products and other contaminants it may be exposed to. If it can’t resist these, the sealer will break down faster and you will have to apply the sealer once again. If the sealer has to be reapplied frequently, you will end up spending a lot of money.
  • The best stone sealer will not only prevent stain-producing substances from seeping into the stone but also make it easier to clean dirt, grime, food, and other contaminants off the stone surface.
  • A high-quality stone sealer can be used to seal both the stone surface and the grout. The other way round doesn’t work, because grout sealers have a bigger molecular structure than stone sealers. So, you can’t use a good-quality grout sealer to seal stone surfaces. It’s also not practical to use two different types of sealers for the stone surface and the grout. Hence, use a good-quality stone sealer for both.

Conclusion

This buying guide will provide you all the pointers you need to select the best stone sealer for marble surfaces at your home or business. However, do keep in mind that even the best stone sealer will have its own set of limitations. It will provide a degree of protection, but in certain situations, no stone sealer will be able to help. This is particularly true for certain types of natural stones. Acid-sensitive stones like marble, limestone, and travertine will get etched if acidic substances are spilled on it or if an acidic-cleaning product is used on it.

Stairs

All types of citrus food items are acidic. The best stone sealer might be able to reduce the effect or provide you with a little time to clean the spill before the etching sets in, but that’s about it. An easy way to differentiate between etching and staining is that etching lightens the color or shade of the stone, while staining darkens it.

There are a couple of things you need to keep in while applying a sealer. Firstly, irrespective of how much research you have done about the sealer you have picked, you should test it in a nondescript corner of the stone surface before applying it to the entire surface. The test will inform you about any unexpected reactions. This is especially important while applying a sealer for the first time on a stone surface.

You should conduct a test even if you have previously sealed the surface with one brand of sealer and you are now going to use a different brand. Secondly, thoroughly clean the stone surface before applying the sealer. Dirt, grime or any other form of contaminant on the stone surface might react badly with the sealer and have an undesired effect.