best sealer for slate

Top 15 Best Slate Sealer – Reviews and Buying Guide in 2022

If you have installed slate flooring in your home or are planning to do so, it must be because you love its high level of durability and gorgeous finish. Whatever your reasons are, you probably already know that slate flooring needs to be sealed to look its best.  

Yeah, that’s true. Because if you don’t, its natural beauty might be damaged by stain, water, and other weather elements. But to maintain the natural look and texture of your stone surface, you will need to invest in the best slate sealer that is durable, safe, and easy to apply.

So, which slate sealer is the most worthwhile to invest in? Well, our team analyzed hundreds of products, both water, and solvent-based, and then rounded up the top-rated sealers currently available on the market.

Need a Quick Decision? Check our Top 5 Slate Sealer

Why Do You Seal Slate?

slate sealers

Once you install slate in your home, you just don’t leave it at that. You must seal it. Because if you don’t, it will get dull and even start wearing out in a short period. But what are the reasons for sealing the slate?. Let’s check them out.

1. Superior protection

For starters, you seal the slate of your home to protect the natural finish of the stone from any kind of damage. Slate sealer can help protect your stone surfaces from stains, UV rays, spills, and other weather elements.

2. Durability

Slate is a porous surface which means it is very susceptible to both wear and tear. It’s no wonder unsealed slate surfaces wear out pretty fast when exposed to elements such as rain, moisture, and even stains. So, the reason for sealing your slate is to extend the life of your stone surface.

3. Ease of cleaning and maintaining

When you seal your slate, you create an impervious layer of dirt on your surfaces. This means that no dirt, spills, or liquids will be able to penetrate the sealed slate. As a result, cleaning and maintaining your surfaces becomes a lot easier.

4. Enhance its visual appeal

By sealing your slate, you get to improve the texture and natural color of your stone surface. This is because most sealers are designed don’t interfere with the natural look of your surfaces. On the other hand, some sealants will give your slate a high-gloss finish for enhanced visual appeal.

Our 15 Best Slate Sealer Reviews

Since there are so many slate sealants available to choose from, you might have a challenging time narrowing down the list to just a few. So, to help you, we are going to review only the top 15 best and most high-quality products that are worth considering.

1. Aqua Mix Sealer’s Choice Gold

It’s no wonder the product is a worldwide bestseller. You can use it on marble, granite, porcelain, limestone, slate, cement, travertine, or any other type of porous tile.

But what makes this product a great choice for many homeowners and professionals alike? First, since it’s water-based, it tends to dry up pretty quickly while also providing a tough stain-resistant finish. Even better, it is sure to protect your stones from stains, oils, and other liquid spillages.

What’s more? You will be pleased to learn that this interior and exterior slate sealer is safe for use in both serving and food prep areas. This is because, unlike traditional solvent-based sealers, this formula is less toxic and harmful to human health and the environment.

Highlighted Features

  • Water-based formula that penetrates deep into the porous stone
  • Can be used as a grout sealer or a pre-sealer
  • Offers superior protection against stains, water, and spills
  • Long-lasting for up to 15 years
  • Quick to apply and dries just as fast

2. Rocklinite Labs Tuff Duck Grout and Marble Sealer

Want a sealer that will provide you with maximum protection for your porous stone surfaces? If the answer is a yes, then Tuff Duck Grout and Marble Sealer is an excellent product. The formula is made from water-based fluoropolymers, thereby providing your floors with superior protection against the most resilient water-based and oil stains.

In addition, this being a penetrating slate sealer, you can be sure that it will not affect the natural look of your stone tiles. Its penetrating features also offer an impervious layer for dirt, which makes cleaning your surfaces a lot easier.

Apart from that, the formula is designed to be durable and will protect your interior stone surfaces for up to 5 years. And if you use it on your exterior surfaces, it may last up to 3 years before you have to reapply it again. However, the manufacturer recommends you apply the formula annually for the best results.

Highlighted Features

  • Made with water-based fluoropolymers for stain protection
  • Up to 200 sq. ft coverage for every quart using single coat application
  • Non-acidic, so it will not affect the natural finish of your surfaces
  • Lasts up to 3-years on exterior surfaces and 5 years on interior surfaces.
  • Deep penetrating formula hence can repel liquids

3. Grout & Granite Sealer from The Floor Guys

If you are looking for the best sealer for slate shower and floors, this professional formula is all you need. One of its selling points is its ease of application. All you’ve got to do is tie your paintbrush to a broom pole to avoid bending and start applying the sealer. And in no time, it will have dried up.

Just like most water-based formulas, this too is made from fluoropolymers. As such, it will do an incredible job of protecting your surfaces against most stains, such as oil and water-based. Also, you will find that cleaning your stone surfaces will be much easier.

Another thing that you are sure to love about this product is how deep it penetrates into the grout lines. This is designed to ensure that moisture vapor can escape from the porous stone for maximum protection in extremely harsh climatic conditions. Consequently, you can use it on outdoor surfaces.

Highlighted Features

  • Seals any natural stone plus sanded and unsanded grout
  • Easy to apply with no odors and dries very fast
  • Offers long-lasting protection against stains, dirt, and spills
  • Seals up to 500 sq. ft of grout and stone with just a single quart
  • Made from water-based fluoropolymers that are ideal for indoor and outdoor use

4. Glaze ‘N Seal – 773 Clear Slate Sealer

Glaze ‘N Seal is one of the most reputable companies that offer sealers and maintenance care products for different natural stones. This specific formula is touted as their best sealer for slate, and for good reasons. For starters, the product contains very low volatile organic compounds (VOC). This, therefore, makes it non-toxic and safe for use on food prep surfaces.

The best part is that since it’s a water-based acrylic formula, it will protect your surfaces against stains, moisture, and spills while also enhancing the natural look of your stone surfaces. And if you use it on outdoor surfaces, you don’t have to worry about salt or UV damage.

Even better, the sealer boasts low gloss/film-forming properties for added protection while providing your stones surfaces with a low sheen appearance. And thanks to this feature, it does a great job of repelling both grease and oil stains. 

Highlighted Features

  • Non-yellowing to preserve the natural color of your surfaces
  • Stain, moisture, UV, and water-resistant
  • Perfect for denser stone surfaces and brick
  • Resistant to the residual salts of efflorescence which can be hard to clean
  • Formulated from acrylic water base compounds for maximum protection

5. Miracle Sealants 511QT6 511 Impregnator Sealer

Need an affordable sealer slate that is also high-quality? You might want to check out this product by Miracle Sealants. Besides being pocket-friendly, the formula boasts wide coverage. Generally, you can cover up to 1,000 square feet with just a single quart of this impregnator sealer.

Something else that you are going to love about this product is the fact that it does not emit harmful vapors during application since it is water-based. As such, you can apply it around your food prep areas.

Also worth mentioning is that you can use this sealer on both your indoor and outdoor surfaces. This is because it is designed to provide ultra-protection against stains by forming a UV transparent layer. Besides, it is not affected by weather elements such as freeze-thaw. 

Highlighted Features

  • Seals a wide range of surfaces by forming a protective barrier
  • Penetrates very deep into surfaces to repel moisture
  • Stain, weather, and slip-resistant for extra robustness
  • Up to 1,000 sq. ft coverage per quart
  • Can be used on bathroom, kitchen, driveway, and patio surfaces

6. Lithi-Tek 9500 Ultra Concentrate Sealer

For the best industrial-grade slate sealer, this water-based formula tops the list. It is made with a proprietary reactive agent designed to penetrate deep into the surface, thereby waterproofing and strengthening the concrete by up to 50%. Consequently, this helps ensure your stone surfaces last for years.

And you know what the best part is? Well, the product is not only waterproof but also resistant to UV rays and slips. More so, it will not fade even when exposed to the harsh UV rays or even yellow. As such, you can use it on your garage floors, driveways, basement floors, and patios without having to worry that it could get damaged by weather elements.

Another thing that makes this product an excellent slate sealer is its ease of application. Yeah, you can choose to apply it using a roller or even a low-pressure pump sprayer. And for hard-to-reach crevices, you can use a brush.

Highlighted Features

  • Forms a protective barrier that is resistant to moisture and abrasions
  • A variety of application methods to choose from
  • Strengthens the concrete by up to 50% for long-lasting durability
  • Reduces efflorescence, moisture intrusion, and water vapor channeling
  • Covers up to 1,000 sq. ft with one gallon in concentrated form

7. AQUA-X 11 1 Gal. Clear Penetrating Stone and Concrete Sealer

If you are searching for a product that is made with professionals in mind, this water-based formula has a lot to offer. For instance, because of its water-based properties, it can repel water and other elements like freeze-thaw, which could damage your concrete surfaces. You also don’t have to worry about salt damage and concrete spalling.

In terms of application, anyone can use the sealer and not just professionals because of how easy it is to apply. Besides, the manufacturer does provide you with a Start Guide and videos of How-To to ensure you do a clean job. The best part is that it will take less than two hours to dry up, which is a short time.

In addition, the sealer contains very low volatile compounds and no harsh chemicals or odors since it is solvent-free. This makes it completely safe for you and your family. Therefore, you don’t really need to wear a mask while using the sealer indoors.

Highlighted Features

  • Offers water and UV resistance to your natural stone surfaces
  • Protects against freeze-thaw, staining, and moisture absorption
  • Gives your surfaces a natural and clear finish that is easy to clean and maintain
  • One gallon covers up to 800 sq. ft depending on the type of surface
  • Long-lasting durability for up to 4 years

8. STONETECH Bulletproof Sealer

The STONETECH Bulletproof sealer is yet another high-quality product that is sure to transform the look of your indoor and outdoor living areas. It features gloss-enhancing properties designed to help preserve the original natural look of most natural surfaces such as granite, limestone, marble, and travertine.

When it comes to formulation, the product is made from advanced water-based fluoropolymers that are breathable for ultimate durability. So, if you use the formula on your interior surfaces, it will provide you with up to 5 years of protection. The best thing is that its water-based properties make it completely safe for your health and the environment.

Just like any water-based sealer, this deep-penetrating formula will also provide your surfaces with superior stain protection against oils and other liquids. Consequently, this makes it easy to clean and even maintain your floors.

Highlighted Features

  • Non-flammable and low-odor for maximum safety
  • Suitable for most tile, grout, masonry, and most porous natural stone
  • Offers coverage for up to 100 sq. ft for each quart
  • Made with advanced water-based fluoropolymers for extra strength
  • Protects your surfaces from unsightly oil, stain, and water damage

9. Concrete Sealer – Acrylic Emulsion Formula

Quality is an important aspect to consider when it comes to buying any product. It’s probably one of the reasons why this acrylic concrete sealer is formulated with the highest-grade Siloxane ingredients. And thanks to this unique formulation, you don’t need to worry about the formation of efflorescence plus the growth of mold and mildew on your concrete surfaces.

And you know what the best part is? The formula is designed to penetrate deep into the surface of the concrete to ensure the natural look and texture of your stone are not altered. In addition, the sealer is breathable to prevent water from being absorbed into the concrete. Consequently, this will protect your surfaces from cracking, staining, salt damage, spalling, freeze-thaw damage, and pitting.

Another thing that will make you want to buy this high gloss slate sealer is its wide coverage. Essentially, if you are going to be applying just a single coat, you can expect to cover up to 1500 sq. ft with one gallon. But if you decide to apply three coats for a high-gloss surface, a gallon will cover up to 500 sq. ft.

Highlighted Features

  • Easy to apply and with a wide coverage area of up to 1500 sq. ft
  • Resists cracking, staining, and erosion because its weather-resistant
  • Offers a high-gloss finish if you apply 3 coats
  • Made from high-quality Siloxane compounds for superior protection
  • Suitable for any stone or concrete floor

10. Black Diamond Stoneworks Wet Look Stone Sealer

Looking for the best high gloss slate sealer? The Black Diamond Stoneworks Wet Look Stone Sealer is sure to give your floors a beautiful glossy, polished finish. Simply put, you can count on this formula to add a slight shine to your natural stone surfaces without darkening them once the sealer dries up. 

Besides giving your floors a shiny glossy look, the product is also designed to protect your stone surfaces from harsh UV rays, water, chemical stains, and wear. Of course, this is because it is completely water-based. More so, it helps keep moisture out for superior longevity.

In terms of coverage, you can cover approximately 500 sq. ft with one gallon. This is a little on the lower side but considering its durability and high-gloss finish; it’s definitely a great buy. And besides, it is also easy to apply via brush, sprayer, or roller.

Highlighted Features

  • Adds an extra layer of protection and shine to stone, concrete, slate, and pavers
  • Durable water-based formula that resists oil and chemicals
  • VOC compliant to ensure your safety
  • No darkening and yellowing helps to  preserve the natural look of your stone surface
  • Gives you a great wet look and a nice gloss finish

11. Armor WL550 Wet Look Matter Enhancer Sealer

If you love the benefits that a solvent based slate sealer has to offer, then you should consider investing in this product. Made from premium-quality, non-recycled resins that have been manufactured in the US, this formula is sure to protect your outdoor surfaces against wear and tear. You also don’t have to worry about the surfaces being damaged by harsh UV rays.

Besides, similar to water-based sealers, this solvent-based formula is also designed to penetrate deep into the surface to help minimize surface water absorption. Therefore, you won’t have to deal with issues like pitting, staining, cracking, spalling, mold growth, and any other damage caused by surface moisture absorption.

Additionally, the sealer is designed to give your surfaces a matte wet look, thereby enhancing their overall appearance. However, to achieve this kind of look, it tends to darken the surface a little bit so it can do away with the dull and faded coloring of the stone.

Highlighted Features

  • Reseal will only be necessary after 3-5 years
  • Highly breathable and UV-resistant for long-lasting performance
  • Enhances color without yellowing the surface
  • Has excellent water-repellent properties
  • Made from non-recycled resins, which makes it solvent-based

12. CC Concrete Coatings SuperSeal Plus Acrylic Water Base Sealer

Here we have yet another budget-friendly slate sealer wet look formula designed to give your concrete surfaces a gloss finish. So, if you’re looking to enhance the appearance of your porous tile surfaces and, at the same time, increase their durability, you might want to consider this product.

But what is it made of? Well, the sealer is formulated with water-based acrylic compounds to ensure it penetrates deep into any concrete surface. Consequently, this helps in ensuring that the natural-look finish of the stone surface remains the same.

Apart from that, it ensures that your surfaces are safe from contaminants, water, and even stains damage thanks to its water-based characteristics. And for added durability, the sealer will also protect your surfaces against yellowing, fading, UV, and fluid absorption.

Highlighted Features

  • Provides you with a semi-gloss or softer matte finish
  • Non-flammable with low VOC for safety
  • Application is either by a roller or a sprayer
  • Brings out the beautiful look of colored and decorative stone surfaces
  • Perfect for both indoor and outdoor use

13. Stain-Proof Plus Impregnating Sealer

This is probably one of the most powerful interior and exterior slate sealer formulas in this review. Of course, for good reasons and one of them is because it contains a super penetrator. As such, it will be able to penetrate deeply even in the densest granite and marble surfaces, thereby providing you with the best protection against stains, water, and salt damage.

 Another thing that customers and critics of this product seem to like is its high breathability level. Thanks to this feature, you won’t have to deal with moisture buildup beneath the surface of your concrete or stone, which could potentially lead to cracking, spalling, and pitting of the treated material. 

In addition, you will be pleased to learn that this sealer features 3 custom sealing molecules to provide you with 3 levels of penetration. As a result, you get to enjoy maximum stain and water repellency on your basalt, quartzite, or bluestone countertops.

Highlighted Features

  • Easy application using a brush, low-pressure hand sprayer, or lamb wool applicator
  • Made with a super penetrator for use on dense natural stones
  • Backed by a 25-year performance warranty
  • Superior stain, water, and oil repellency
  • Offers 3 level penetration for utmost protection and durability

14. MORE Premium Stone Sealer

Made in the USA, the MORE Premium Stone Sealer is a water-based formula designed to improve your stone’s natural color without sacrificing quality. This, therefore, makes it among the best professional-grade slate sealers on the market as far as stain protection is concerned.

Like other slate sealers, this formula works by creating an invisible barrier for enhanced protection against water and oil-based stains. As a result, cleaning and maintaining the natural look of your stone surfaces become easier since the sealer tends to dissolve dirt. And in the end, your grout will end up looking new.

Something else that different users seem to love about this product is how safe it is since it’s a water-based slate sealer. Therefore, you can safely apply it to food prep areas. Also, you won’t need to wear a mask or open all the doors and windows of your house for additional ventilation.

Highlighted Features

  • Safe and effective on tile, granite, slate, stone, and marble surfaces
  • Dries up very fast – taking around 15 minutes between coats
  • Creates a strong barrier against dirt, stains, and oil
  • Easy to spray on and wipe clean without leaving any haze or residue
  • Enhances the natural color and texture of your stone

15. DOMINATOR Stone+ Gloss Clear Acrylic Sealer

Want to give your natural stone surfaces a wet look satin finish? Well, this acrylic sealer will help you enhance the beauty of your stone with a gloss finish. You just spray the sealer on, back roll it, and leave it dry for that amazing look.

Besides enhancing the look of your surfaces, the product will also protect them against spills, harsh UV rays, scratches, and oil stains since it is water-based. In addition, this formula offers a low VOC, so you don’t need to worry about breathing in harsh odors or chemicals.

Another feature that makes this product an excellent buy is its amazing coverage rate. Typically, if you are using it on dense stones such as travertine, it will give you a coverage rate of between 600 and 800 sq. ft for a single gallon. But if you apply it on more porous stones like bluestone, you can expect a coverage rate of around 400 sq. ft per gallon.

Highlighted Features

  • Forms a breathable film that is UV, stain, and slip-resistant
  • Solvent-free formula with no strong odors
  • Safe and user-friendly for indoor and outdoor surfaces
  • Professional-grade quality for ultimate protection
  • Incredible coverage rates of up to 800 sq. ft

How to Choose the Right Slate Sealer – Buying Guide

Because of the many slate sealer products available on the market, you might have a hard time finding the best one for your needs. Luckily for you, this guide will provide you with all the key pointers you need to choose the right product.

Longevity of the sealer

One of the key things to look out for when buying the best sealer for slate tile is its durability. This is because some products will only last for 6 months and then you have to reseal again. On the other hand, some can last for 2-5 years while others up to 15 years. So, be sure to check the longevity of the sealer.

Water-based vs. Solvent-based

Most sealers are either water-based or solvent-based. But which one is a better choice? After all, both formulas are fairly easy to apply, offer a level of stain and UV resistance as well as protect against wear and tear of your stone surfaces.

Well, overall, water-based formulas are the most preferred option because they don’t emit strong odors or even fumes. As such, you will find them safe for human health and the environment. But you can still find high-quality solvent-based formulas. 

Coverage Rate

Another thing to consider is how much square footage the sealer can cover. Different products provide different coverage rates. For instance, some products will allow you to cover up to 200 sq. ft per quart, which is equivalent to 0.25 gallons.

On the other hand, you will find that some formulas can cover up to 1500 sq. ft per gallon for a single coat, thereby providing you with more value for your money. So, it is up to you to decide what you prefer.


In terms of safety, you might want to choose a water-based sealer that is solvent-free. This is because these formulas don’t produce harmful odors, which makes them ideal for indoor use.

Also, you should look out for products with low volatile organic compounds (VOC). And if you plan to apply the sealer on your kitchen countertops, you should consider getting a product that is safe for use in food prep areas.

Clear vs. Enhanced Finish

If you don’t want the natural look or appearance of your stone surfaces altered in any way, you should go with products that offer a clear finish. Also, if your floors are made of marble or any polished stone, a clear finish will be the ideal choice for you.

But if you would like to enhance the beauty of your stone, you should choose a formula that is designed to provide an enhanced finish, which could either be more or slightly glossy. Such sealers are commonly known as wet-look sealers, and they tend to slightly darken the color of the stone.

Ease of use and application

If you are not planning to hire a professional to apply the sealer on your behalf, you are better off choosing a product that is easy to use and even apply.

And if this is your first time using a slate sealer, you should consider getting a product that comes with clear How-To guides. This way, you don’t end up ruining your precious natural stone.

Type of Stone Surface

For most slate sealers out there, you can use them on most porous natural stone surfaces such as limestone, travertine, sandstone, and marble. However, some products may not be able to penetrate denser stoners to provide you with long-lasting protection.

Therefore, be sure to check whether the sealer you plan to buy is compatible with the type of surface you plan to use it on.

How to Clean and Seal Slate

how to clean slate before sealing

If you have slate floors in your home, you must clean them with care, so you don’t end up damaging the natural stone. And if you plan to seal the slate, then you need to do it the correct way. But what is the right way to clean and seal the slate? Here are simple steps that you should follow:

Step 1: If your floors have some traces of an old sealant, you need to first remove it using a chemical stripper before applying a new one.

Step 2: Next, sweep or vacuum the floor to get rid of dirt, dust particles, and any loose debris. You may use a dust mop with a clean microfiber pad, dry mop, or a soft-bristled broom to avoid scratches. But if you don’t plan to apply a sealer, then you can skip step one as well as 5, 6, and 7.

Step 3: Get clean water and add a few drops of mild dish detergent to it. Then, using a washable mop or a soft rag, start cleaning your slate floors.

Step 4: Rinse off the floors with clean water and then use a soft towel to dry any water on the slate surface. You don’t want to leave standing water on the slate as it could seep into the pores and damage the surface.

Step 5: Once your stone surface is clean and dry, mask off adjacent areas that you don’t intend to apply the sealer. This way, you won’t have to worry if you accidentally splash some sealant on those areas.

Step 6: If you already have your slate sealer, apply it on your surface according to the manufacturer’s instructions. And for the best results, you should work in small sections.

Step 7: Lastly, get a clean cotton towel or cloth and buff the sealed surfaces before the sealant dries off to avoid causing further scratches. Then, leave the sealer to dry up for some time based on the amount of time the manufacturer recommends before applying another coat.

Tips for Sealing Slate Floor Tiles

sealing slate floor tiles

Sealing your slate floor tile offers so many benefits. And you don’t wanna mess things up while applying the sealer. So, below are some tips to help you do a good job.

Tip#1: Before you start applying the sealer for slate floor, you should first do a spot test of the product on an extra piece of slate. This way, you will know if it works as you would like or not.

Tip#2: Make sure your slate floor tiles are thoroughly clean and dry. There should be no loose dirt or debris on the floor.

Tip#3: You must give your sealed slate the recommended time to dry before you proceed to apply another coat.

Tip#4: When sealing the slate, you should apply the sealer on each piece of the slate individually or according to the manufacturer’s instructions.

Tip#5: Be sure to use the right application tools based on what the manufacturer recommends. If the manufacturer says that you can’t apply the sealer using a spray applicator, then don’t do it.

Tip#6: If there are any traces of old sealants or some kind of topical finishes like waxes, make sure to strip them off before applying a new coat of slate sealer.

Frequently Asked Questions (FAQs)

Still, stuck on whether it is a good idea to seal your slate floors or not? Check out these frequently asked questions about slate sealants.

1. Does sealing slate make it slippery?

If you use a penetrating sealer, the answer is no. However, some topical sealers make the surfaces slippery when wet. That’s why you should only use a high-quality and breathable sealer that is formulated to penetrate deep into the surface.

2. Which is the best sealer to use if you want a slate wet look?

You should get an enhancer slate seal which can either be water or solvent-based. However, solvent-based slate enhancers are the most recommended option. They tend to offer a better glossy finish with a wet look.

3. How long can the slate sealer last?

Their longevity varies from one product to another. Some sealers will only last for up to 2 years, while others can last up to 5 years or more. So, be sure to check what the manufacturer says about how long you should wait before resealing your slate.

4. What makes the slate turn yellow?

It happens when the slate is worn out and then becomes exposed to water, bleach, and other harsh chemicals. This is because natural stones have iron, and when it comes into contact with water, it oxidizes, thereby causing the slate to turn yellow.

5. What is the best product to clean slate surfaces with?

You may use a slate cleaner, mild dish soap, mild laundry detergent, or any other cleaning solution formulated specifically for washing natural stone. Also, you will need a soft-bristled broom or a dust mop.

Final Words

You probably will agree with us that slate is undoubtedly one of the best and most desirable natural stone floors on the market. And not just because of its ability to resist scratches, stains, spills, cracks, and other weather elements but also for its beautiful dark looks.

But of course, to maintain its good looks, you must reseal it as often as possible using the best slate sealer. And overall, the Aqua Mix Sealer’s Choice Gold is our top pick because of its high level of durability compared to most products. But if you’re looking for a budget-friendly option, you might want to try the Miracle Sealants 511QT6 511 Impregnator Sealer.

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