XIAMETER™ OFS-0777 Siliconate Water repellent for masonry and natural surfaces Penetrating and breathable. Low VOC.  Nonflammable Features & Benefits. Imparts water repellency to a wide variety of substances. Can be applied by vacuum impregnation or surface treatment (brushing/ rolling/ dipping) for the surface treatment of wood. Reduces water absorption into the substrate, thus reducing spalling due to freeze-thaw and efflorescence, thereby increasing the life of the substrate.