Is the Sealer Breathable?

One of the reasons acrylic sealers are commonly used for exterior applications is because they are "breathable" — they provide good water repellence while allowing moisture vapor within the slab to escape. Most penetrating sealers are also breathable.

Epoxies offer excellent water repellence, but some products are impermeable and can end up trapping moisture in the concrete. If you suspect that excess moisture is present in the slab, whether indoors or out, make sure the sealer you use is permeable and won't restrict the ability of the concrete to release moisture vapor as needed. Read this article by Robert Cain for more information on controlling moisture-vapor transmission.

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