Hydrostop™ Sealer

Product Code:K-733


Hydrostop Sealer is a high-performance penetrating sealer used by itself to protect concrete, brick, mortar and masonry from the damaging effects of water intrusion.

Hydrostop Sealer is a clear, water-based liquid that is sprayed or rolled onto horizontal or vertical surfaces. It does not affect appearance or breathability, and will not wear, fade, yellow, crack or peel.

Hydrostop Sealer contains a unique blend of silane and siloxane compounds that chemically react with silicates below the surface of the substrate to form an insoluble, water-repellent barrier.

Features & Benefits

Recommended Uses


Physical Properties
Appearance Milky white liquid, dries clear
Density g/cm³ (lb. /cu. in.) 1 (0.036)
pH 7-8
VOC < 20 g/L (including water, California and OTC States), EU (w/w) < 2%
Performance Properties
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) 89%
Chloride Intrusion Reduction (NCHRP 244, Series II) 76%
Accelerated Weathering Reduction in Soluble Chloride (NCHRP 244, Series IV) 90%


Before using this product, refer to Application Instruction 7.11 — Sealing Above Grade Concrete & Masonry.
Apply Hydrostop with a low pressure sprayer while the surface temperature is above 4 °C (40 °F) and remains 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.


Hydrostop Sealer is available in 18.9 L (5 US gal.) pails and 208 L (55 US gal.) drums.

Shelf Life

When stored between 4°C – 38°C (39°F – 100°F), Hydrostop has a shelf life of at least 2 years in unopened containers. Do not allow the product to freeze.


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.