Siloxa-Tek® 8500 Concrete Sealer

An industrial-grade, water-based, silane/siloxane penetrating concrete sealer engineered to reduce water & moisture intrusion while protecting concrete brick & masonry from chlorides and salts.

  • Coverage Up to 250 square feet
  • Coats 2
  • VOC Content 90 g/L
  • Finish Natural
  • Concentrated Ready-to-use or concentrated
  • Warranty 100 Year Warranty
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Siloxa-Tek 8500 is our favorite concrete sealer to treat nearly any application. A proprietary blend of silane/siloxanes, this clear penetrating concrete sealer not only prevents deicing salt, chloride and freeze-thaw damage, but its hydrophobic nature resists moisture intrusion and vapor transmission. It dries completely clear with a natural finish that will not change the look or appearance of the susbtrate. This is the go to choice to seal any concrete, brick, or masonry based substrate especially driveways, basements, patios and garages.


Exceptional when used for:
  • Applications: Driveways/sidewalks, patios, pool decks, garages, chimneys, roof tiles and more
  • Substrates: Concrete, concrete blocks/cinderblocks, brick, pavers, exposed aggregate, stucco, stone, slate, sandstone
  • For enhanced performance on horizontal concrete surfaces use a densifying primer, wait 7 days and then apply the Siloxa-Tek 8500.



  • Water beading effect
  • Excellent penetration
  • Breathable substrate
  • Easy application
  • Tack free finish
  • No appearance change
  • Low VOCs
  • DOT approved


  • Deicing salt/chloride damage
  • Freeze-thaw damage
  • Spalling/pitting/cracking
  • Mold/mildew growth
  • Efflorescence
  • Dirt pick up
  • Water vapor transmission


  • ASR/Alkali attacks
  • Water ingress
  • Moisture intrusion
  • UV radiation

Siloxa-Tek 8500 Rises Above

Siloxa-Tek 8500 meets or exceeds the following tests:

  • ASTM E-96: Water Vapor Transmission
  • ASTM E-514: Water Penetration
  • ASTM C-672: Scaling Resistance
  • AASHTO T-259: Chloride Ion Penetration
  • NCHRP 244 II/IV: WVT, Chloride Intrusion
  • OHD L-34: Depth of Penetration

Water Vapor Transmission & Chloride Intrusion Percentage Improvement vs. Control

Siloxa-Tek® 8500
Sealer Product

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Product Comparisons

Uses Concrete, Masonry, Brick, Stone Concrete, Masonry, Brick, Stone
Chemistry Silane/Siloxane Modified Silane/Siloxane
Carrier Water-Based Water-Based
Finish Natural Natural
Color Clear Clear
Application Method Sprayer, Roller Sprayer, Roller
VOC Content 90 g/L 90 g/L