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Types of Concrete Sealers

This page explains the different types of concrete sealers to help in deciding which to use. There are two basic types of sealers: those that form a membrane on the surface of concrete and those that penetrate below the surface.

Surface Sealers

The most widely used sealers are those that form a protective barrier on the surface to keep any foreign substance from being absorbed including water, salts, oils, rust, and most other chemicals and stains. These sealers include:

• Acrylic Sealers
  Acrylics sealers are relatively soft compared to the other types, but are ideal for exterior applications because of their UV resistance and they allow moisture in the concrete to escape. They create a shiny, wet look and can greatly enhance the appearance of colored and decorative finishes. Acrylics are available as sovent-based or water-based. Solvent-based will hold up better than water-based on exterior surfaces. But for interior surfaces, especially finished interiors, water-based acrylics are ideal because they are much less toxic with very low odor.
• Epoxy sealers
  Epoxies are much stronger than acrylics but do not allow moisture in the concrete to escape. This makes them more suitable for garages and interior floors. They also leave clear, shiny finish and they bond well with concrete surfaces. The drawback of epoxies is they require much more surface preparation before application and usually cost more than acrylics.
• Urethane sealers
  Urethanes are the strongest but most expensive. These are usually reserved for industrial use and should be left to professionals.

Penetrating Sealers

Penetrating sealers are mostly silicone-based and work by penetrating the surface and reacting with free lime to form calcium silicate. It's like filling the pores and capillaries with cement. They will actually strengthen the concrete itself and prevent water from migrating through the concrete. This can be especially beneficial to concrete that has begun to show signs of deterioration and basement walls to prevent water seepage. Penetrating concrete sealers will not alter the appearance of concrete nearly as much as surface sealers by not creating the shiny, wet look.

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