Dr. Wall Care Weather Guard is a siloxane penetrating sealant designed specifically for the treatment of masonry materials and concrete surfaces. It protects concrete and masonry surfaces from the effects of exterior exposure and weathering. In all, it penetrates deep into the surface pores and reacts chemically to provide a durable, long lasting barrier against water and salt intrusion. This level of protection can substantially reduce the damaging effects of freeze/thaw cycling, precipitation, acid rain, efflorescence, and dust/dirt degradation. It preserves the natural appearance without membrane build-up