Water repellent for masonry surfaces (AQUAREST WR 100) is an aqueous solution of Potassium methyl Siliconate, water dilutable having slightly yellowish appearance used for the impregnation of mineral construction materials to make them water-repellent without significantly reducing water vapor permeability. WR 100 provides its water repellent properties by reaction with atmospheric carbon dioxide.

Appearance Solid Content(Available) Specific Gravity Flash Point, open cup pH Diluent
Clear to slightly yellow 40% to 65% 1.25 to 1.4 >93 °C 13 Water

Typical Values – Should not be considered as specifications.


• Imparts water repellency to a wide variety of substances.
• Reduces water absorption into the substrate, thus reducing spilling due to freeze-thaw and efflorescence, thereby increasing the life of the substrate.
• Colorless and non-yellowing protection preserves the natural appearance of the substrate.
• Penetrating and breathable.
• Low VOC.
• Nonflammable.


Treatment with potassium methylsiliconate prevents efflorescence of salts absorbed and makes cleaning of the tiled floor easier. Low fired clay products such as roof tiles, bricks, unglazed floor tiles absorb water and the soluble salts are transported to the surface, disfiguring the product. Damage caused to the wet substrate/ clay product due to growth of moss, lichen and algae is also a common problem spoiling the beauty of the facade. All the above phenomena are observed only if the masonry surface remains wet. They will be eliminated if one can prevent or at least reduce water absorption. Water resistance is an important factor in concrete and masonry construction for safety, health and comfort of building occupants. As with all siliconates, WR 100 can cause a white deposit on the surface of colored construction materials, or if used outside the application guidelines.


When stored bellow 45°C in the original unopened containers, WR 100 has a usable life of 12 months from the date of manufacturing.


Product safety information required for safe use is not included. Before handling, read Material Safety Data Sheets (MSDS) and container labels for safe use, physical and health hazard information.