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Why Concrete Needs Protection
Environmental factors such as moisture, changing temperatures and chemicals gradually break down unprotected concrete. When water enters the pores and cannot escape, it encourages mould and mildew growth and may lead to surface scaling, cracking or spalling over time.
Because of its porous nature, concrete benefits significantly from a protective barrier that reduces moisture uptake and shields it from aggressive contaminants.
How Concrete Sealers Work
Concrete sealers are chemical compounds that protect concrete by limiting water and contaminant penetration. They act as water repellents, helping prevent the slab from becoming saturated and reducing the risk of damage from soluble chemicals such as chlorides.
By forming either a barrier on the surface or a protective layer within the pores, sealers help extend the service life of both new and existing concrete.
Types of Concrete Sealers
There are four common types of concrete sealers, each with specific performance benefits:
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Penetrating sealers: These infiltrate and react chemically within the pores of the concrete, creating a barrier against moisture and soluble chemicals while leaving the surface appearance largely unchanged.
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Acrylics: Acrylic sealers create a thin protective film on the surface. Available in solvent based and water based formulations, they can enhance colour and provide a low to medium sheen finish.
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Polyurethanes: Similar to acrylics but higher build, polyurethanes form a thicker, more durable film. They are commonly used on floors in high traffic areas where abrasion resistance is important.
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Epoxies: Usually supplied as a two component system mixed before application, epoxy sealers create a very tough, thick coating that offers excellent chemical and wear resistance for demanding environments.
While these sealers differ in appearance and performance, they all aim to strengthen and protect the concrete surface.
Where and When to Use Them
Exterior concrete such as driveways, paths and exposed slabs are ideal candidates for sealer application. Constant exposure to sun, rain, traffic and chemicals can significantly reduce their expected lifespan if left unprotected.
When correctly selected and maintained, concrete sealers can help exterior surfaces perform for decades, supporting both structural integrity and appearance.
