Water-Based, Silane/Siloxane Penetrating Water Repellent

Chemstop WB is a water-based, ready to use, siloxane/silane water repellent. CHEMSTOP WB REGULAR is formulated for use on dense surfaces, such as pre-cast or poured-in-place concrete. CHEMSTOP WB HEAVY DUTY is used on porous surfaces such as light weight concrete, concrete block and mortar joints.

Features & Benefits

  • Allows concrete/masonry repel water and salts
  • Colorless & odorless
  • Non-staining, non-yellowing, breathable
  • Reduces efflorescence and spalling
  • Will not alter texture or appearance of treated surface
  • Can contribute to LEED points


  • Concrete
  • Concrete block
  • Lightweight concrete
  • Brick
  • Mortar joints
  • Precast structures
  • Horizontal or vertical
  • Interior or exterior

Specifications / Compliances

  • CHEMSTOP WB meets performance standards of SS-W-110C
  • Complies with all U.S. EPA and local VOC regulations, including OTC, LADCO, Maricopa County, and California (CARB and SCAQMD)


CHEMSTOP WB is packaged in 55 gal (208 L) drums, 5 gal (18.9 L) pails, and in cases of 1 gal (3.8 L) jugs (6 jugs per case).