Masonry Magazine November 2003 Page. 29
WHEN IT COMES TO CLEAR, PENETRATING, breathable water repellants for use on above-grade, porous substrates, you basically have three options: silanes, siloxanes or room temperature vulcanizing (RTV) silicone rubber. All three are similar in that:
They contain silicone in some form.
They are penetrants.
They allow the substrate to breathe, allowing moisture vapor to escape while keeping water out. This is extremely important as it prevents freeze-thaw damage.
There is little or no change to the appearance of the substrates to which they are applied - they cure to a clear, flat finish.
Silanes and Siloxanes
THE TECHNOLOGIES differ in their composition, solids content and capabilities. I mentioned that silane, siloxane and silicone rubber repellants contain some form of silicone. Silanes and siloxanes are produced from the same basic raw material, silane. Being organic, their resistance to ultraviolet rays, salt spray, acid rain and airborne pollutants is somewhat limited. They are easily broken down and one should not expect them to provide protection beyond a few years.
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November 2003 Masonry 27