Unlike acrylics, silicones, and other waterproofing sealers that form a film on the surface and trap water vapors, Chimney Rx masonry waterproofing products allow deep penetration of the active ingredients of up to 1/4 inch or more. As a result, the special siloxanes in Chimney Rx Masonry Chimney Water Repellent react to form strong chemical bonds beneath a treated surface. These bonds allow the chimney water repellent to become a physical part of the structure and provide long-lasting water repellent protection without altering the appearance of the brick. Remember, shipping is FREE (contiguous US only).
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