Hydrostop Sealer is a clear, water-based sprayable liquid which activates a water-repellent effect on the surfaces of concrete, brick, mortar and masonry. Hydrostop Sealer works better and lasts longer than conventional sealers because it contains a unique blend of silane and siloxane compounds which chemically react with silicates below the surface of the substrate. This reaction forms an insoluble, water-repellent barrier within the surface that cannot wear away, fade, yellow, crack or peel. The finished application is virtually invisible, leaving the surface with its original appearance and breathability. Use Hydrostop Sealer over Hydrostop Coating as a part of the Hydrostop Restore & Protect Systemâ„¢ to increase value and performance of that system.

Product Features

  • Long service life translates into low overall cost

  • Easy to apply

  • Waterborne

  • Fast drying and low odor

  • Excellent penetration

  • Breathable – excellent vapor transmission

  • No change of surface gloss or appearance

  • No darkening or only very slight darkening of original surface color

  • Low VOCs (Volatile Organic Compounds)


  • Outlasts other water sealers by 5 to 1

  • Excellent water-repellency

  • Excellent moisture vapor transmission

  • Works as a chloride screen to protect against salt attack from de-icing salts, sea water, etc.

  • Helps to protect reinforcing steel from corrosion

  • Resists acid rain and other chemicals

  • Helps to prevent freeze/thaw damage

  • Resists mildew and moss formation

  • Resists rust stains and efflorescence

  • Easy to clean-up with water