Hydrostop™ Sealer

(Water-Based Water-Repellent Sealer)
Product Code: K-773


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.


Key Benefits

Recommended Uses

Physical Properties

Appearance Milky white liquid, dries clear
Density g/cm³ (lb. /cu. in.) 1 (0.036)
pH 8
VOC < 20 g/L (including water, California and OTC States), EU (w/w) < 2%


Water Absorption (Fed Spec SS-W-110-C) 0.3%
Water Absorption Reduction (NCHRP 244, Series II) 72%
Water Penetration Reduction Under ‘Wind Driven Rain’
(ASTM E514)
Chloride Intrusion Reduction (NCHRP 244, Series II) 76%
Accelerated Weathering Reduction in Soluble Chloride
(NCHRP 244, Series IV)


For protecting existing concrete and masonry, refer to Application Instruction 7.11 — Sealing Above Grade Concrete & Masonry.

Hydrostop is best applied with a low pressure sprayer while the surface temperature is above 4 °C (40 °F) and must remain above 4 °C (40 °F) for a minimum of 24 hours. Apply at the recommended rates of coverage:



Read the Safety Data Sheet (SDS) for this product. For professional use only. This product may irritate eyes, skin and the respiratory tract. Avoid contact with skin or eyes. Avoid breathing mist. Wear long sleeves, safety goggles and impervious gloves.


Shelf Life

Hydrostop Sealer has a minimum shelf life of 12 months in its original, unopened containers. Do not store Hydrostop Sealer at temperatures below 4 °C (40°F).


Kryton International Inc. (Kryton) warrants that Kryton products are free from manufacturing defects and comply with the specifications given in their respective technical data sheet. Because conditions of use, such as site conditions, surface preparations, workmanship, concrete ingredients, weather, structural issues and other factors are beyond the control of Kryton, no warranty can be given as to the results of use. Purchaser agrees to seek the advice of qualified professionals and to determine for themselves the suitability of the products for their intended purpose and assumes all risks. Purchaser’s sole remedy is limited to replacement of any product proven defective or at Kryton’s option refund of the purchase price paid. THIS LIMITED WARRANTY CONTAINS THE ENTIRE OBLIGATION OF KRYTON. NO OTHER WARRANTIES, EXPRESS OR IMPLIED, SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. KRYTON SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES. No representative of Kryton has the authority to make any representations or provision except as stated herein. Kryton reserves the right to change the properties of its products without notice.