Litres Required
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Including 10% wastage allowance
Choose the right concrete sealer for every surface, exposure, and performance requirement in 2026
Master all concrete sealer types — penetrating, acrylic, epoxy, polyurethane, and siliconate — with full comparison tables, application rates, coverage calculator, and real-world use cases for floors, driveways, foundations, and outdoor slabs.
A complete professional reference covering every concrete sealer type, how they work, where to use them, and how to apply them correctly
Unsealed concrete is porous — it absorbs water, oils, de-icing salts, and chemicals that cause staining, freeze-thaw damage, corrosion of reinforcement, and surface deterioration. A concrete sealer fills or lines these pores to reduce permeability, extend service life, and improve aesthetics. Sealing is one of the most cost-effective maintenance steps for any concrete surface, from residential driveways to industrial warehouse floors in 2026.
Penetrating sealers (silanes, siloxanes, siliconates, silicates) soak into the concrete matrix and react chemically to reduce water absorption without changing the surface appearance. Film-forming sealers (acrylics, epoxies, polyurethanes, polyaspartics) form a protective coating on the surface, providing a visible finish — from matte to high-gloss — along with abrasion and chemical resistance. The correct choice depends on exposure, traffic, and aesthetic requirements. Learn more about how concrete structure affects sealer performance in our existing concrete structures assessment guide.
Sealer selection depends on five key factors: substrate condition (new vs. existing), exposure environment (interior, exterior, below-grade), traffic type (foot, vehicular, forklift), chemical exposure (oils, acids, de-icers), and desired finish (natural, gloss, colour-enhancing). Using the wrong sealer — for example, a film-forming acrylic in a permanently wet below-grade application — leads to delamination, whitening, and premature failure. Our selector tool below guides the right choice.
There are five major families of concrete sealers used in 2026, each with distinct chemistry, penetration depth, film thickness, and performance characteristics. Understanding how each type works is essential before selecting a product for any specific application.
Cross-section showing where each sealer type acts relative to the concrete surface
Penetrating sealers leave no visible film; film-forming sealers build a measurable coating above the surface. Both significantly reduce water and chloride ingress.
The most effective penetrating waterproofers. Silanes (smaller molecules) penetrate deepest (up to 10 mm), ideal for dense, low-porosity concrete. Siloxanes penetrate less deeply but cover more surface area per litre. Both form a hydrophobic lining within pores that repels liquid water while allowing vapour to escape — critical for bridge decks, facades, and below-grade walls exposed to chloride-laden environments.
Sodium, potassium, and lithium siliconates react with calcium hydroxide in the concrete to form calcium silicate hydrate (C-S-H), densifying the surface and closing micro-pores. Commonly called densifiers or hardeners. Used extensively on polished concrete floors to increase hardness, reduce dusting, and improve chemical resistance. Lithium siliconate is preferred in 2026 for its lower efflorescence risk and compatibility with most concrete mixes.
The most popular film-forming sealer for decorative and exterior concrete. Water-based and solvent-based formulations are available in matte, satin, and gloss finishes. Enhance the colour of exposed aggregate, stamped, and stained concrete. Provide moderate UV resistance and water repellency but require reapplication every 1–3 years depending on traffic. Easy to apply by roller or sprayer and suitable for concrete floor surfaces in residential settings.
Two-component epoxy systems provide the highest adhesion and chemical resistance of any film-forming sealer. Ideal for garage floors, industrial facilities, food processing areas, and warehouses where oil, fuel, acids, and heavy abrasion are present. Epoxy is not UV-stable — it yellows and chalks outdoors — so it is limited to interior applications or must be topcoated with a UV-stable polyurethane or polyaspartic in 2026.
Single or two-component polyurethanes offer superior abrasion resistance, flexibility, and UV stability compared to epoxy. They are the premium choice for interior floors exposed to heavy foot or forklift traffic, exterior concrete subject to thermal movement, and anywhere a long-lasting high-gloss or satin finish is required. Water-based polyurethanes are low-VOC and suitable for food-safe environments with appropriate formulation.
A polyurea-based coating that combines the UV stability of polyurethane with very fast cure times (walkable in 1–4 hours). Polyaspartics can be applied at temperatures from –10°C to 50°C, making them suitable for year-round installation including winter projects. In 2026 they are widely used as single-coat garage floor systems and topcoats over epoxy base coats, offering excellent scratch and chemical resistance with minimal downtime.
The table below compares all major concrete sealer types across the most critical performance and application parameters to help you make the right choice for your specific project in 2026. For retaining wall and foundation applications, also review our backfill materials guide as drainage and sealing work together to protect below-grade concrete.
| Sealer Type | Category | Finish | UV Stable | Reapply Every | Best Application |
|---|---|---|---|---|---|
| Silane | Penetrating | No change (invisible) | Yes | 5–10 years | Bridge decks, facades, exposed concrete |
| Siloxane | Penetrating | No change (invisible) | Yes | 3–7 years | Masonry, retaining walls, driveways |
| Lithium Siliconate | Penetrating / Densifier | Slight sheen | Yes | Permanent (once reacted) | Polished floors, warehouse slabs |
| Acrylic (water-based) | Film-Forming | Matte to satin | Good | 1–3 years | Stamped concrete, pathways, driveways |
| Acrylic (solvent-based) | Film-Forming | Satin to gloss | Good | 1–2 years | Decorative/coloured concrete, exterior |
| Epoxy (2-part) | Film-Forming | High gloss | No (yellows) | 5–10 years (interior) | Garage floors, industrial interiors |
| Polyurethane (1K) | Film-Forming | Satin to gloss | Yes | 3–5 years | Interior/exterior floors, retail spaces |
| Polyurethane (2K) | Film-Forming | High gloss | Yes | 5–8 years | Heavy-traffic floors, food processing |
| Polyaspartic | Film-Forming | Satin to high gloss | Yes | 5–10 years | Garage floors, fast-turnaround projects |
Example: Sealing a 50 m² garage floor with a 2-coat epoxy system at 4 m²/L: 50 ÷ 4 × 2 coats = 25 litres total. Always add 10% wastage allowance for rough or porous surfaces.
Enter your area and sealer type to calculate how many litres you need
Different concrete surfaces have different exposure conditions, substrate porosity, traffic levels, and aesthetic requirements. The table below provides a quick-reference sealer recommendation for every common concrete surface type encountered in residential and commercial construction in 2026.
| Surface / Location | Recommended Sealer | Key Requirement | Reapplication | Notes |
|---|---|---|---|---|
| Driveway (exterior) | Siloxane or Acrylic | Water & salt repellence | 2–3 years | Avoid film types in freeze-thaw zones |
| Exposed Aggregate Path | Solvent Acrylic (gloss) | Colour enhancement | 1–2 years | Enhances stone colour significantly |
| Stamped / Decorative Slab | Water-based Acrylic | UV & colour stability | 2–3 years | Low-VOC; safe near landscaping |
| Garage Floor (residential) | Epoxy + Polyurethane topcoat | Oil & abrasion resistance | 5–10 years | Profile surface (diamond grind) first |
| Warehouse / Industrial Floor | 2K Epoxy or Polyurethane | Heavy load, chemical resist. | 5–8 years | Min. 3 mm concrete moisture test |
| Polished Concrete Floor | Lithium Siliconate + PU topcoat | Hardness & gloss retention | Densifier permanent; topcoat 3–5 yr | Apply densifier at grit 400 stage |
| Basement / Below-Grade Wall | Silane (below grade) or crystalline | Positive-side waterproofing | 5–10 years | Must address hydrostatic pressure |
| Bridge Deck / Carpark Deck | Silane 40% concentration | Chloride ingress prevention | 7–10 years | Critical for rebar protection |
| Pool Surround | Water-based Acrylic or PU | Slip resistance, wet areas | 2–3 years | Specify anti-slip aggregate additive |
| Retaining Wall (external) | Siloxane penetrating | Water repellence, breathability | 5–7 years | Must remain vapour-permeable |
Correct surface preparation and application technique are just as important as product selection. The majority of concrete sealer failures in practice are caused by poor preparation — not product quality. Follow this process for all sealer types in 2026.
Even correctly specified sealers can fail if application conditions are not met. The most common problems encountered in concrete sealer applications in 2026 are listed below with their causes and remedies.
The density and surface treatment of concrete floors — including sealer type — influences both impact and airborne sound insulation ratings. Understand the full picture before specifying a floor system.
Floor Acoustics Guide →Before selecting a sealer for an existing concrete surface, a thorough condition assessment identifies contamination, carbonation, chloride ingress, and surface profile — all of which influence sealer selection and preparation requirements.
Concrete Assessment Guide →Sealing below-grade concrete is only one part of foundation waterproofing. Correct backfill material selection and drainage design are equally critical to preventing water ingress and hydrostatic pressure build-up.
Backfilling Foundations Guide →