MasterProtect H 400 is a water-based, 40% alkylalkoxysilane penetrating sealer. It provides long- lasting protection against moisture intrusion, freeze/thaw cycles, and chloride intrusion. 

Product Highlights

  • Excellent penetration protecting against damage from moisture intrusion and chloride ion penetration

  • 40% silane

  • Ideal for traffic-bearing surfaces

  • Breathable to allow interior moisture to escape without damaging sealer

  • Does not alter surface appearance

  • One component for ease of application 


  • Interior or exterior

  • Horizontal and vertical

  • Above grade

  • Parking garages

  • Stadiums

  • Bridge decks

  • Concrete highway road surfaces

  • Ramps and barrier rails

  • Many other reinforced concrete structures 


  • Concrete substrates 
    • Architectural

    • Glass-fiber-reinforced

    • Precast

    • Cast in place