Mark Wolf | posted on November 30, 2020 at 12:15 PM

If you purchase a product through one of our links, BobVila.com and its partners may receive a commission.

Concrete sealants provide an important layer of protection against unsightly stains and scratches on concrete surfaces such as countertops and patio pavers. Using concrete sealants can help eliminate long-term damage caused by moisture and chemical intrusion. Indoors or outdoors, concrete lasts longer and performs better with some protection.

The best concrete sealers are designed for where you need them and create the finish you like. You can choose a permeable concrete sealant to provide near-invisible protection and refresh the surface texture, or choose a film-forming concrete sealant to obtain a smooth, durable finish. Read on to learn more about choosing and using the best concrete sealant.

When choosing a concrete sealant, it is helpful to understand the range of options available. Each type of sealant has qualities that make it perform well in different applications, so the following breaks down some of the most important characteristics of concrete sealants.

The permeable sealant seals the pores of the concrete below the surface. They form a chemical barrier to prevent the intrusion of moisture and chemicals (such as ice melting products).

Most of these sealants provide invisible protection without changing the appearance of the surface. Most are breathable, allowing moisture to escape. Because they provide excellent protection against inclement weather, permeable sealants are an excellent choice for driveways, sidewalks, terraces, and other outdoor locations.

The permeable sealant protects the external concrete surface from freeze-thaw damage and corrosion. It can be cured within 24 hours to provide a natural appearance and provide excellent weather protection without making the surface slippery, changing the surface appearance or leaving a gloss. It is easy to spray with a pressurized garden sprayer, paint roller, or high-volume low-pressure (HVLP) sprayer.

Acrylic concrete sealants are solvent-based or water-based formulations. These products are good choices where simple application and low cost are important.

They form a thin protective film that can well prevent the penetration of moisture and chlorides, while still allowing water vapor to escape from the slab. Acrylic concrete sealants are available in different gloss grades and can be used to enhance the color, bare or stamped concrete on internal or external concrete surfaces. Outdoors, it has anti-ultraviolet (UV) function and does not turn yellow.

Acrylic sealant can be dried in 1 hour, and it takes 36 to 48 hours to fully cure, which makes it ideal for projects that need to be completed quickly. They can protect the surface and enhance the color of indoor floors, or prevent external concrete surfaces from being damaged by moisture and salt.

Acrylic resin is generally thinner than epoxy or polyurethane, so it wears out faster and must be reapplied more frequently, approximately every 3 years. For outdoor projects, solvent-based acrylic is a better choice than water-based. Use a pump sprayer or roller to apply a very thin coating.

Epoxy concrete sealant adds a thick protective surface to concrete to extend wear resistance and abrasion resistance. This type of sealant has a high degree of water resistance and increased gloss, and is available in transparency or color. It is much harder than acrylic, but it does not allow trapped moisture to escape from the concrete slab.

These durable sealants are often used for floors in high-traffic areas, such as garages and basements, or for concrete countertops. Epoxy sealants turn yellow when exposed to ultraviolet light, so they are limited to indoor use. Most are two-part products and must be mixed before application.

After mixing, the sealant must be applied immediately before hardening. An effective application method is to pour the mixture on the surface, spread it evenly with a scraper, and then smooth it with a lint-free roller.

The protective film provided by polyurethane concrete sealant is twice as thick as acrylic resin, but not as thick as epoxy resin. Polyurethane offers water-based or solvent-based formulations and a range of gloss levels, with excellent abrasion resistance and chemical resistance. It is suitable for indoor and outdoor applications and provides non-yellowing, transparent and durable finishes.

Polyurethane concrete sealant is used for floors and concrete countertops in areas with heavy traffic, or to protect and reinforce colored, exposed aggregates or stamped concrete. Use a large-volume, low-pressure (HVLP) airless sprayer or microfiber mop for spraying to form a thin and uniform coating.

In addition to the type, there are other factors involved in determining the best concrete sealant. To choose the best sealant for your project, consider the following.

The performance of concrete sealants varies depending on the surface type. Permeable sealants are usually the best choice for high-traffic exterior concrete surfaces such as driveways, sidewalks, and balconies. In cold climates, use silane or silane/siloxane mixtures because they are the most resistant to the abrasion effects of scraping and ploughing. In warm climates, silane/siloxane mixtures or acrylics can work well. Acrylic is most suitable for decorative, high-gloss or color-enhancing applications.

Over time, concrete floors in basements, garages and shops will be subject to many abuses. Water-based or solvent-based acrylic will provide a high degree of protection, but solvent-based usually lasts longer. Concrete countertops must be sealed to avoid staining. This is the ideal location for epoxy or polyurethane concrete sealers.

Moisture and salt are the two enemies of concrete. The porous texture of concrete allows moisture to invade, causing cracks during the freeze-thaw cycle, requiring concrete sealers or crack fillers. Salt from melting ice, lawn chemicals, ocean waves, and other sources can corrode and weaken concrete. The best way to prevent these elements from damaging your driveway, sidewalk or patio is to use sealant to keep them out.

For most exterior surfaces, permeable concrete sealants are the preferred type to block moisture and chemicals. Permeable sealants are safer in cold or humid environments because they do not change the surface texture of concrete. They are almost invisible, so the concrete retains its original appearance.

Solvent-based sealants, including solvent-based acrylic resins, produce fumes called volatile organic compounds (VOC), which are irritating and harmful to the skin and eyes. Long-term exposure to VOC can cause a series of chronic health problems.

Water-based sealants emit almost no VOC, so they are generally safer during application. For best results, choose the water-based sealant with the longest maintenance application interval so that you don't have to deal with the product frequently.

The exterior concrete sealant finish must be UV resistant, waterproof and durable. It is also important that they allow moisture to escape and will not become slippery in winter or wet weather. Permeable sealants are used for barely visible finishes, or acrylics are used for a range of gloss options.

Indoor sealants are more likely to be used in ways that enhance decoration. Although UV resistance is not required indoors, the indoor sealant must still be waterproof, despite the air permeability of the flat floor. Choose acrylic for the floor and epoxy or polyurethane for the countertop.

Acrylic concrete sealants are highly durable and flexible in terms of aesthetic appeal. This type of sealant is coated with a smooth, transparent surface and provides a range of gloss from matte to glossy.

Epoxy concrete sealant is the most versatile product used to protect concrete countertops. Epoxy resin provides a thick, extremely durable, glossy finish, with clear coating or a variety of colors to choose from.

Most concrete sealants can be sprayed with a garden pump sprayer or a high-pressure low-volume (HPLV) sprayer, or they can be sprayed with a lint-free paint and dye roller. Epoxy resins need to be thoroughly mixed with resin and curing agent before use. Then apply it with a notched spatula, and finally smooth it with a lint-free roller.

If you are planning to seal concrete driveways, floors or countertops, check out the following recommendations for the best concrete sealants for your project.

Foundation Armor concrete sealant is a breathable, non-yellowing, solvent-based acrylic resin. It darkens concrete and pavers, makes them look damp, has a durable low-gloss finish, and brightens dull or faded surfaces. It can be applied to unsealed concrete surfaces or concrete surfaces previously sealed with solvent-based acrylic sealants.

Acrylic concrete sealants help reduce damage and deterioration caused by surface wear, freeze-thaw cycles, and chemical exposure. It can prevent flaking, flaking, cracking and pitting. The product is suitable for indoor and outdoor applications. It can last up to 3 years on outdoor concrete surfaces and up to 7 years indoors before recoating is required.

RAIN GUARD is a water-based silane/siloxane penetrating concrete sealant. It protects horizontal and vertical masonry and wood surfaces with a high-performance hydrophobic coating. Choose from 6 ounces, 1 gallon, and 5 gallons to get the quantity that suits your project. It has excellent water resistance, salt spray, deicing chemicals, and wind-driven rain performance. One application can last up to 10 years.

This permeable concrete sealant continues to be clear. It will not change the appearance of the surface, leave a surface film, produce gloss or turn yellow. It can be used as a primer before painting to prevent moisture transfer and prevent oil and mold stains.

MasonryDefender's permeable sealant is a water-based silane/siloxane mixture that provides long-lasting breathable and waterproof protection. This is a good choice for concrete driveways, terraces and other outdoor applications that do not want to change the appearance of the surface.

Choose from 1 gallon or 2.5 gallon size. The environmentally friendly silane/siloxane mixture combined with minerals can penetrate concrete and form a long-lasting invisible barrier to prevent water penetration, staining and chemical damage. The treated surface can resist pitting corrosion and cracking. The product is easy to spray on clean concrete with a pumped garden sprayer and can be used for up to 5 years.

EnduraSeal is a professional grade, high solids, pure acrylic concrete sealant, using a low odor solvent base. It is designed to protect and beautify concrete, with a semi-gloss, wet appearance, UV resistant and non-yellowing durable coating.

It is used for internal and external surfaces, including colored surfaces, stamped concrete, and exposed aggregates. It can resist oil, grease, salt, chemicals, abrasion and other abrasion in high flow areas. It can also protect pavers, terrazzo, stone and stained concrete. Apply with a sprayer or roller; two thin coats are recommended.

TotalBoat is a two-part system composed of epoxy resin and curing agent, which provides crystal clear, durable, smooth film with high gloss. This epoxy resin is BPA-free, VOC-free, and safe for food after curing, making it an excellent choice for concrete countertops.

It is pourable, self-leveling, and smooth like glass. It is waterproof and resistant to scratches, yellowing and staining. It is not as white as other epoxy resin products and has good heat resistance. In addition to protecting and penetrating concrete, it can also be applied to wood, stone, metal and ceramic surfaces. It is available in 2 quart, 1 gallon and 2 gallon kits.

SEAL-ONCE concrete and masonry sealants combine proprietary penetrating nanotechnology with polyurethane to provide long-lasting, long-lasting protection. Choose from 1 gallon or 5 gallon size.

The sealant can penetrate concrete pores and prevent water damage through a durable waterproof barrier within the concrete surface. It can prevent weathering, cracking, flaking, mold and mildew growth, travertine and freeze-thaw damage.

Nano Poly forms a durable surface coating that prevents UV fading, abrasion, and water damage. The product is a water-based, low-VOC, non-toxic, and ecologically safe sealant that will not harm pets, plants or people. When used, it is milky white and becomes dry and transparent. It protects for up to 10 years on vertical surfaces and up to 6 years on horizontal surfaces.

Eco-Tuff concrete sealant is made of bio-urethane, which has excellent surface resistance to water, ultraviolet light, chemicals, scratches, abrasion and heat resistance. This sustainable, non-toxic sealant is plant-based, almost odorless, VOC-free, and red-listed chemicals.

The Red List is a collection of chemicals and building materials that are harmful to humans collected by the International Institute of Future Life. The purpose is to raise awareness and promote healthy alternatives in building construction.

It is available in 1 gallon and 5 gallon sizes, with glossy, matte and satin finishes to choose from. It can be used for indoor or outdoor applications on concrete, wood, primer metal and other natural surfaces to provide a long-lasting, durable protective coating. It can be applied easily with mechanical HVLP sprayer, decorative pad, roller or high-quality brush.

It can be used for water-based coatings on a variety of surfaces and can be used with decorative chips, mica flakes or non-slip powders to improve traction. An application lasts for 5 to 10 years, depending on location, traffic, and exposure.

Foundation Armor’s sealing agent is a silane/siloxane mixture with 10 times more active ingredients than competitors. It is a breathable sealant that allows moisture to escape from the concrete while reducing moisture absorption through the surface by 95%. It works under the surface and does not change the appearance or color of the surface.

This water-based, low-VOC, high-solids sealant can be applied to the inner or outer surface of unsealed vertical and horizontal concrete, bricks, paving stones, flagstones and slate. The product has been approved and used by the Department of Transportation in several states to protect roads and bridges from water absorption and freeze-thaw damage.

Using a pump garden sprayer or roller, water-based sealants can be applied quickly and easily. The protection lasts for up to 10 years, and then you need to reapply.

Foundation Armor concrete sealant was selected for its acrylic formula, easy to apply and breathable, non-yellowing formula, and is our first choice. Although the application requires 2 coats, the formula has a subtle low-gloss finish and is compatible with about 2 layers of sealed or unsealed surfaces. 175 square feet per gallon, indoor or outdoor.

Or, for those who wish to cover a larger surface area, RAIN GUARD concrete sealant covers a comparable area of ​​150-200 square feet per gallon at a lower price. Although this pick does not come with a sprayer or roller for application, it is a safe water-based silane/siloxane formula that can last for more than 10 years and can be applied clearly.

The right concrete sealant can extend the life of outdoor patios, basement floors or concrete driveways in the next few years. The choice of the best penetrating sealant depends on the ease of application, durability, type, maximum coverage and type of finish.

The above options give priority to making application easier by spraying or rolling 1-2 layers of sealant. Although the drying time may take several hours to several days, once dry, these sealants can withstand abrasion, ultraviolet light, abrasion, and moisture to achieve long-term durability. This is due to durable acrylic, water-based silane/siloxane, epoxy and polyurethane formulations that can last 3-10 years.

Depending on the project you need to complete, these options are also available in small or large quantities, ranging from 6 to 400 square feet. Finally, you can also choose high-gloss finishes or transparent applications according to personal preference. Other additional features that these options include include non-yellowing finishes, breathability, and compatibility with metal, wood, stone, and ceramic surfaces.

Whether it is a new building, a renovation project, or after a deep cleaning on the weekend, you can consider applying a layer of concrete sealant to complete the work. Combined with general wear and tear, unsealed concrete may be damaged by freezing, thawing, and salt exposure.

In addition, it can easily become a host for moss and mold, thereby further weakening it. Cracks, delamination and other structural problems are more likely to occur in unsealed concrete. The concrete sealant repels moisture, otherwise it will cause long-term damage. The service life of a sealed concrete driveway is 30% longer than that of an unsealed driveway.

Another benefit of applying concrete sealant is that it can protect the color and decorative details of the stamped, colored and exposed aggregate concrete. It resists pollution from chemicals, rust, petroleum products, and hard water that may affect unsealed concrete. Cleaning the sealed concrete is also faster and easier.

If you are planning a concrete sealing project, you may still have some questions about purchasing and using these products. Read on to see answers to several common questions about choosing and applying concrete sealants.

There are several variables to consider when choosing the right concrete sealant for the project. As a general rule, penetrant sealants, indoor floors using acrylic sealants, and concrete countertops using epoxy or polyurethane sealants should be used to seal concrete driveways. Note the differences between these types listed earlier in this article.

In most cases, the best way to apply concrete sealants is to use a high-volume, low-pressure (HVLP) or airless sprayer. They can handle almost any sealing machine and provide optimal control. They also allow users to cover large areas quickly and efficiently.

Rolling with ¼ to ⅜ inch raising rollers can be used with many water-based and solvent-based sealants. It becomes less effective on rough or textured surfaces and sealants with a solid content of more than 35%.

No, you should not apply concrete sealant on old sealant. Before applying a new coating, wear or peel off the old sealant and clean the surface thoroughly.

The best way to apply most concrete sealants is to use HVLP or airless sprayer.

Yes, concrete sealants will wear out over time. When water no longer forms beads on the permeating sealing surface, usually after about 10 years, it is time to reseal. When acrylic, polyurethane, or epoxy starts to look worn and dirty (usually after about three to five years), it's time to reseal.

Disclosure: BobVila.com participates in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide publishers with a way to earn fees by linking to Amazon.com and affiliate sites.

You agree that BobVila.com can process your data in the manner described in our privacy policy.

Copyright © 2021 Acton Media Inc. all rights reserved.