The Difference Between Penetrating and Coating Sealers?

Penetrating Sealers

Penetrating sealer

Penetrating sealers such as CCS Natural Seal HV, CCS Streetscape Sealer, CCS Stain Block and CCS Stainblock Enricher protect concrete by penetrating into the capillaries of the concrete – rather than lying on the surface.

Penetrating sealers repel moisture whilst allowing transmission of vapour from within the concrete or structure. Suitable for both floors and vertical walls, penetrating sealers are often applied to walls to protect them from the ingress of rain and airborne salts that can ultimately attack the steel reinforcing within the concrete.

Because they don’t alter the texture of the concrete, penetrating sealers such as CCS Streetscape Sealer, CCS Stain Block and CCS Stainblock Enricher are ideal for horizontal surfaces where slip resistance may be an issue. These three products contain special fluoropolymers and additives that effectively protect the surface from the ingress of water and oil based stains.
Penetrative Sealers have a natural look and in many cases, when dry are not visible until water is placed on the surface causing it to bead.

Coating Sealers

Surface coating urethane sealer

Coating or Film Forming sealers effectively cover as well as penetrate into the surface of concrete creating a very thin film. Water or solvent are used as carriers to move resin from the coating into the pores of the concrete. The carrier (water or solvent) then evaporates leaving the residual resin to dry anchor into the concrete surface.

Many of the coating sealers create a ‘wet look’. Differing gloss levels are available from gloss to low sheen/satin. If a ‘wet look’ or colour enhancement is not desired, a penetrative sealer should be considered.

Coating sealers do create a thin film and depending on the product and application method, will impact on slip resistance.

Traction aids can only be applied in conjunction with film forming coatings, not penetrating coatings.

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