Yes, moisture that is in or on the treated material or surface passes through the treatment. After curing, the treatment is somewhat hydrophobic (water repellent) but it should not be considered a replacement for commercial water repellents. The microorganism is attracted to the treated surface and punctured by the long molecular “sword.” This is a physical rupture of the cell membrane, Zonitise is not consumed by the organism and stands ready to defend the surface from the risks of cross contamination.