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Ghostshield: Siloxa-Tek 8500

Ghostshield: Siloxa-Tek 8500

Regular price $59.88 Sale

Siloxa-Tek 8500 is our favorite product to treat nearly any application. A proprietary blend of silane/siloxanes, this clear penetrating sealer not only prevents deicing salt and freeze-thaw damage, but its hydrophobic nature resists moisture intrusion and vapor transmission. This is the go to choice to seal any concrete, brick, or masonry based substrate especially driveways, basements, patios and garages. Natural Finish, low luster


Exceptional when used for:
  • Applications: Driveways/sidewalks, patios, pool decks, garages, chimneys, roof tiles
  • 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


      • 1 gallon (Ready to Use)
      • 1 gallon concentrate (makes 5 gallons)
      • 55 gallon (Ready to Use)

      Tech Data

      Application Instructions - Ready to Use

      Application Instructions - Ultra Concentrate


      Customer Reviews

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      Ask a Question
      • Hi, how long does it take to ship to 72687 zip?

        3 to 4 days

      • What is the percentake of solid in s-tek 8500

        Since it is a penetrating sealer, it isn't spec'd on percent solids, but percent actives, which is 40%.  You don't want solids in penetrating sealers.

      • why can't I use this product over ardex v 1200. It was first recommended to use 4500 first coat and then 8500 for the second coat. What will happen to the ardex v 1200 if sealed with this product? will it break down the ardex? The thickness of the ardex is only 1/4" max to a feather finish. there's more 1/8" to feather finish

        I dont see anything in the product data that says you cant use it on Ardex.

      • Are there any sealers that dry with a gritty surface that would help keep surface from being slick when wet?

        You can add grip to most surface sealers.  Check out Cryli-Tek 5505, Super Diamond Clear and Polyseal Plus, and shur- grip

      • I have a Sand Stone chimney that appears to be leaking into my home not through the roof but through the stone and or mortar joints. The chimney is 30 years old. What product do you recommend to correct this problem? How often should I re-apply after the initial application? Is it better to spray or roll it on? Thank you!

        Any of the Ghost Shield Siloxa-Tek lines would work for sealing sandstone.  My go to is the Siloxa-Tek 8510 as it provides the longest protection.  I would reccomend two coats, wet on wet, and you shouldnt have to touch it for 10 years.  

        Roll or spray is a matter of preference, but for a vertical application, we prefer rolling as you have lest waste.  

      • Do you accept tax exempt certificates?

        Yes we do.

      • Do you have the primer for a concrete kitchen counter. ?

        Ghostshield doesnt make a countertop primer, however they do make a few different countertop specific sealers.  Check out the countertop specific products here:

      • Can this product be used for a fountain and can it be brushed on. Thank You

        For a fountain, we would recommend Siloxa-Tek 8510.  It can be applied with a brush, roller or sprayer.

      • What is the best method to apply this product?

        We generally prefer a roller application as it allows for a more even distribution of product.  For this product, you would want to use a 3/8" nap roller and apply until the surface is saturated.  If applying two coats, make sure to use a wet on wet application.

      • Will this help on patios that sweat due to no water barrier laid

        Absolutely. For an exterior patio  I would recommend Siloxa-Tek 8510

      • Average coverage of one gallon of Siloxa-Tex 8500?

        This is a product where two coats are needed, so a gallon would cover 250 square feet, once.  You would need two gallons to cover 250 sq ft per manufacturer's reccomendations. 

      • Is one coat adaquste

        We recommend 2 coats for the best protection. 

      • I need to buy the ghoshield concrete sealer 8500. I have 40 square feet areas that need to sealed. How much do I need to buy

        You would need less than a gallon.