Concrete Sealer

The BECOSAN® sealer protects concrete surfaces from liquids and chemical agents without altering the appearance of the floor. It penetrates the substrate, enhances durability, and simplifies long-term maintenance.

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What is the BECOSAN® concrete sealer?

The BECOSAN® sealer is a liquid solution applied to concrete floors to close surface porosity and protect against external agents. It penetrates the substrate and reacts chemically with internal components of the concrete, creating an invisible barrier that strengthens the surface without forming a film or plastic layer.Unlike other surface coatings, the BECOSAN® sealer does not peel over time or wear away due to friction. Once integrated into the material, it extends the service life of the floor, makes cleaning easier, and improves the concrete’s resistance to liquids, oils, grease, and other substances commonly found in industrial environments.

This treatment:
  • Seals pores and micro-cracks in the concrete.
  • Limits absorption of water, oils and contaminants.
  • Facilitates daily cleaning and reduces maintenance costs.
  • Enhances the floor’s resistance to stains and chemical wear.
  • Complements the BECOSAN® system by working in synergy with the densifier.

It is a highly effective and long-lasting solution, ideal for surfaces that demand high levels of durability, hygiene, and ease of maintenance, such as warehouses, factories, logistics centres or indoor car parks.
applying protective sealer into concrete
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Why use a concrete floor sealer?

The BECOSAN® sealer is applied to reduce the porosity of concrete and improve its resistance to liquids, oils, and chemical agents without altering the appearance of the surface. Unlike surface coatings, this sealer does not form a film — it penetrates the substrate and acts from within, reinforcing the upper structure of the material.

Its primary function is to protect the floor without creating issues such as delamination or surface wear. The result is a concrete surface that is easier to maintain, less prone to staining, and more stable under heavy use or mechanical cleaning.

The application process is straightforward and does not interfere with daily operations. It is a practical solution for facilities that require a hard-wearing, functional, and uniform surface, without adding complexity to ongoing maintenance.

Steps

Professional application of the BECOSAN® protective sealer

Applying a concrete floor sealer requires precision and technical expertise. Although the process may seem straightforward—spraying the sealer and spreading it evenly—its effectiveness hinges on the timing and conditions of application. At BECOSAN®, this treatment is not used in isolation but as an integral part of a professionally polished concrete system, where each stage serves a defined purpose.

The sealer performs at its best when applied over a surface that has already been densified and mechanically prepared. This preparation allows the product to penetrate deeply, bond correctly with the substrate, and enhance the floor’s functional properties, improving its resistance, cleanliness, and durability.

1. Surface ready – After densification, the concrete is clean, porous and prepared for sealing.

2. Mechanical or manual distribution using industrial mop.

3. Absorption time and chemical reaction with the substrate.

4. Excess removal – Remove surplus material to avoid marks or crystalline residue.

5. Final polishing – Proceed with the polishing stage to achieve the desired finish and performance.

Surface protection and performance

BECOSAN® Protective Sealer

At BECOSAN®, we apply a specialist sealer as an integral step in our industrial polished concrete system. Used after densification and before the final polishing stage, it ensures:

  • A sealed surface that’s easy to clean.
  • Enhanced resistance to stains, oils and chemicals.
  • Reduced liquid absorption and improved surface behaviour.
  • Long-lasting protection of gloss and industrial aesthetics.

This treatment creates an invisible barrier that strengthens the concrete’s surface and protects it from everyday operational challenges. The result is a cleaner, more resilient floor that retains its appearance and performance – even in the most demanding environments.

FAQs

Frequently asked questions about concrete sealers

Sealers also close the pores on the surface to reduce the absorption of water and mineral salts that damage the surface or form an impermeable layer that prevents such materials to penetrate.

Investigations by the main international concrete authorities such as American Concrete Institute, Portland Cement Association and National Ready Mix Concrete, among others, confirm that the majority of concrete damage is due to the penetration of moisture on the surface.

The most common form of concrete damage is scaling of the surface by freezing or thawing, as the surface expands and contracts.

Other common forms of concrete damage include alkali-silica reaction (ASR), chemical intrusion and corrosion of steel reinforcements in reinforced concrete.

In recent decades, attempts to protect concrete have included sealers ranging from wax to linseed oil. Today, high-quality concrete sealers can minimize surface moisture up to 99%.

There are two main categories of industrial concrete sealers:

  • Topical sealers or guards (“coatings”)
  • Penetrating  sealers (reactive)

Surface sealers:

Surface sealers can provide visual enhancements and topical protection against stains and chemicals. They require a dry, clean surface during application to gain adhesion.

Topical sealers can alter the coefficient of friction that can cause substrates to become slippery when wet, a condition that can be remedied by adding anti-slip materials.

Penetrating sealers:

Penetrating sealers can be applied to dry or wet surfaces and must properly match the porosity of the substrate to effectively penetrate the surface and react.

The chemical reaction binds the active ingredients within the substrate that minimizes surface moisture. Penetrating sealers generally do not significantly modify the appearance or traction of the substrate.

Acrylic resins:

Acrylic resins create a film-forming membrane on the surface of the substrate. Available in both water-based and solvent-based formulations, they are affordable and generally easy to apply.

They are well known for increasing perceived visual improvement (sometimes described as a “wet look”) and can provide good UV protection for colour substrates.

Despite being the smoothest and least durable of the major sealer categories, price and convenience make acrylic resins a popular choice for decorative concrete such as stamped concrete and exposed aggregate.

Acrylic resins are also commonly used as curing agents for new concrete, and many meet ASTM C309.

Epoxy / urethane systems

Epoxy / urethane systems are also film-forming membranes.

They share many of the same characteristics as acrylics, but performance levels and life are higher and proportionately more expensive due to more complex installation requirements.

Epoxy / urethane systems are generally applied only to fully cured existing concrete, although certain epoxy products may meet ASTM C309.

Silane concrete sealer

Silane is the smallest molecular compound of commonly available penetrating sealers.

Chemically, silane forms a covalent bond within porous masonry that coagulates surface pores.

Silane is known to be hydrophobic and oleophobic and will only wear if the concrete surface is worn. Known for its low viscosity, silane is often used to seal dense concrete, such as parking platforms, concrete facades and dense brick.

Silane is generally applied only to fully cured existing concrete.

Silicate concrete sealer

Silicates are another small molecular compound ranging from premium lithium silicates to more economic sodium silicates.

Chemically, silicates form calcium hydrate and silicate crystals that can densify concrete surfaces and burnish/polish to develop a glossy finish.

Silicates are known to be hydrophobic and oleophobic and will only wear if the concrete surface is worn. Known for their crystallization, silicates are often used to polish concrete floors at large industrial or commercial facilities.

Silicates can be applied to new and existing concrete, although they do not meet ASTM C309 as a curing agent.

Siliconate concrete sealers

Siliconates are molecular compounds of moderate size. Chemically, siliconates form a repellent cross-linking membrane barrier within the surface of porous concrete and other masonry.

Siliconates are known to be hydrophobic and oleophobic and will only wear if the concrete surface is worn.

Known for their extreme water and stain repellency, siliconates are often used to seal exterior concrete such as roads and driveways, sloping walls, porous brick and porous stone.

Siliconates and organic siliconates have also proven effectiveness as curing agents for new concrete and certain products can meet ASTM C309.

Siloxane concrete sealer

Siloxane is the largest molecular compound of commonly available penetrating sealers.

Although not highly reactive, siloxane chemically forms a bond within porous masonry that coagulates surface pores.

Siloxane is known to be hydrophobic. Known for its large molecular structure, siloxane is often used to seal exterior concrete, porous concrete blocks and porous bricks.

Siloxane is generally applied only to fully cured existing concrete.

In short, all major concrete sealer chemistries can have valuable and practical applications.

Topical sealers generally require higher application and maintenance standards, but the decorative appeal and their stains and chemical resistance can make them a superior choice for many applications.

Penetrating sealers must be combined with the porosity of the substrate for low maintenance water repellency and long lasting freeze/thaw protection.

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