A penetrating sealer is a concrete sealer that soaks into the surface and reacts or fills pores below the top, instead of forming a film on top.
Understanding Penetrating Sealers
A penetrating sealer works inside the concrete. It soaks into the pores and either lines them or reacts with the cement to repel water. Common types include silane, siloxane, silicate, and fluoropolymer products. The surface looks almost the same after sealing, and it does not form a film that can wear off or peel.
Penetrating vs. Topical Sealers
Topical sealers such as acrylics, epoxies, and urethanes build a film on the surface and can add gloss or color. Penetrating sealers leave a natural finish and breathe better, but they do not add much shine or stain resistance. Pick based on the look the customer wants and how the slab is used.
Where They Work Best
Exterior flatwork, driveways, pool decks, and concrete exposed to freeze-thaw cycles and deicing salts are all good fits. Because they keep traction, they are also a smart choice for walkways and ramps.
Practical Tips for Applicators
The slab must be clean and open enough to accept the sealer, so test absorption with a splash of water first. Apply to a dry surface, avoid puddles, and follow the data sheet on timing. Check coverage rates, since porous concrete can take far more material than smooth concrete.
Also Called
Impregnating sealer, penetrating concrete sealer, silane siloxane sealer
