Water Repellent

Professional® Water Sealant is a unique penetrating water repellent which is manufactured using room temperature vulcanizing (RTV) silicone rubber as the active ingredient. This high performance “gun grade” silicone rubber was developed for use by the military during World War II to meet applications requiring superior durability and resistance to extreme temperatures. It’s use provides all formulations of Professional® Water Sealant with performance characteristics that far exceed those of other penetrating water repellent technologies.

A Superior Alternative to Silanes and Siloxanes

  • Capable of bridging hairline cracks (400% elongation)
  • Protects even the most porous, lightweight concrete block
  • Effectively protects all natural stone and all above-grade porous substrates
  • Provides extremely long lasting, durable protection
Additional Performance Characteristics
  • Breathable (allow for moisture vapor transmission)
  • Penetrating (lines the substrates pore structure)
  • Transparent (dries clear and flat; may slightly enhance some substrates)
  • Withstands wind driven rain
  • Provides masonry structures with protection from damage caused by:
    • Freeze-thaw cycles
    • Efflorescence
    • Calcium Carbonate stains
    • Mold
    • Acid rain
    • Chloride Ion penetration
Available in Three Strengths

Professional Products of Kansas, Inc. manufactures three strengths of Professional® Water Sealant that provide superior protection for all types of porous, above-grade building materials.

PWS-5 Regular

Hard fired brick, poured concrete, most horizontal surfaces

PWS-8 Extra

Very porous brick and concrete, stucco, sandstone and limestone

PWS-15 Super

Split face, fluted, expanded shale and other extremely porous block





Useful Links:


Application and Testing

[Application Instructions, RILEM Technical Bulletin, Mock Up and Testing Guidance, Test Patch Coverage Chart, Estimated Coverage Rate Chart]

Product Data Sheets

[Water Repellents, Graffiti Resistant Coatings, Graffiti Remover, Efflorescence Cleaner]


[Professional Water Sealant Original Formulation, Phase II Cleaner, Eff-Stop Cleaner, <120 Low Solids VOC, <100 VOC]


[5 year and 10 year; vertical and horizontal]