Siloxa-Tek® 8510 Concrete Sealer

The highest-performing and longest lasting, breathable, deep-penetrating, clear-drying, water, salt and oil repellent concrete sealer comprised of 100%* actives.

  • Coverage Up to 300 square feet
  • Coats 2
  • VOC Content 100 g/L
  • Finish Natural
  • Warranty 100 Year Warranty
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Siloxa-Tek 8510 is the deepest penetrating, highest performing and longest lasting concrete sealer in the Siloxa-Tek line. Comprised of 100%* actives it is able to resist water instrusion, deicing salts, chlorides, freeze-thaw cycles and staining from oils and greases. This proprietary {silane/siloxane} concrete sealer contains a proprietary stain repellent additive and dries completely clear with a natural finish that will not change the look or appearance of the susbtrate. It is an excellent choice to seal concrete driveways, garages, shop floors, patios, warehouses, parking lots, highways and bridges.


Exceptional when used for:
  • Applications: Commercial, industrial & retail concrete floors and slabs. Stadiums, plazas, food courts, parking garages, machine shops. Also used for exterior concrete driveways, garages and patios.
  • Substrates: Concrete, concrete blocks/cinderblocks, brick, pavers, exposed aggregate, stucco, stone, slate, sandstone
  • For enhanced performance on horizontal surfaces use a densifying primer, wait 7 days and then apply the Siloxa-Tek 8510.



  • What it is: Penetrating, solvent-carried, water, salt and oil resistant concrete sealer
  • What it's for: Concrete floors, plazas, food courts, parking garages, shop floors. Also used for concrete driveways, garages and patios, brick, stone & masonry
  • What it does: Waterproofs and seals concrete & masonry, resists deicing salts and staining from oils/greases


  • What it is made of: Solvent-carried silanes, siloxanes, proprietary stain repellent additives
  • What's the finish/color: Clear, flat, natural
  • How do you apply it?: Solvent-rated sprayer, roller or brush


  • What's so special about it: This 95% actives formulation resists staining from oils and greases, protects against deicing salts and waterproofs concrete
  • What else is like it?: Siloxa-Tek 8500: Resists deicing salts and water but will not resist staining. Siloxa-Tek 8505: Water-based and cost-effective version of the 8510

Siloxa-Tek 8510 Rises Above

Siloxa-Tek 8510 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® 8510
Sealer Product

Auxiliary Information

  • Technical Specs

    • Feature: Water, salt, oil & stain repellent
    • Chemistry: Modified Silane/Siloxane
    • Color: Clear
    • Finish: Invisible
    • Category: Penetrating
    • Packaging: 1 Gallon, 5 Gallon
    • Coverage: Up to 300 sq. ft. per gallon
    • Interior/Exterior: Interior/Exterior
    • Application Method: Roller, solvent rated sprayer, brush
    • Application Temperature: 35 F - 95 F
    • Number of Coats: 2 (wet-on-wet)
    • Time Between Coats: 5 Minutes
    • Drying Time (dry to touch): 6 Hours
    • Drying time (full cure): 24 Hours
    • Time before/after rain: 48 Hours
    • New Concrete: Yes, at least 28 days after being poured
    • Storage/Shelf Life: 1 Year
    • Clean up: Mineral Spirits
    • Paintable: No

    *Product actives content varies ±5% (active content >95% - <100%)

  • How It Works

    A water repellent impregnating sealer is a surface applied, invisible, non-film forming protection system, that can very effectively increase the durability of concrete. Due to the small size of the mono-molecular layer, there is little or no change in its aesthetic appearance. Compared to film forming coating systems, the surface applied water repellent impregnating sealer penetrates the surface pores and capillaries, so they are internally lined but not filled. Water repellent impregnating sealers change the surface tension of mineral substrates that produce a water repellent surface to keep water and aggressive water-soluble salts, such as chlorides and sulfates, out.

    In structures on and below grade water should generally be kept out and away to prevent damage. The most pervasive form of concrete damage is surface scaling from freeze-thaw. Other forms of damage include alkali-silica reaction (ASR), chemical intrusion and corrosion of steel reinforcements. Siloxa-Tek® 8510 can block up to 99% of surface moisture. The active ingredients seal the pores within the substrate adequately blocking surface moisture while still maintaining the concretes ability to breathe. It will not significantly modify substrate appearance or traction and will only wear away if the concrete surface itself wears away.

    New or existing concrete can be treated and performance can be improved in as little as two applications. Backed by a 100-year warranty, Siloxa-Tek® 8510 oil repellent sealer is a small investment that leads to long-term savings and improved performance.

  • Preparation

    1. New “green” concrete must be properly cured. Concrete should obtain 80% of design strength, typically achieved within 14-28 days.
    2. The concrete substrate must be structurally sound and clean of oil, grease, dirt, wax, curing compounds, efflorescence, paints, previous sealers, adhesives and other contaminants that might interfere with the penetration of the sealer. Power wash, acid etch or mechanically scarify as necessary to achieve the desired surface condition. Allow for proper dry time before application. The surface-zone moisture content of the concrete should not exceed 4% wt. Do not apply if standing water is visible.
    3. Surface and air temperatures must be at least 35°F during application. Surface and air temperatures should not exceed 95°F. Do not apply when temperatures are expected to fall below 32°F within 8 hours or when rain is expected within 12 hours following application. Keep material from freezing. If freezing conditions exist before application, let the substrate thaw before application. Do not apply during inclement weather or when inclement weather is expected within 12 hours.
    4. Crack, patching and expansion joint sealants can be applied before application; always test for compatibility and adhesion.
    5. Protect people, property, vehicles, window glass, roofing materials, plastic products, shrubbery, landscaping and all surfaces not set for treatment from overspray.
  • Application

    1. Always test a small area before application to ensure desired performance, aesthetics, coverage rates and to verify application technique. Let test area dry thoroughly, 5-7 days, before inspection.
    2. Stir material throughly before and during application. Do not dilute or alter material for purposes other than specified.
    3. Apply with a solvent-resistant roller, brush or low-pressure, non- atomizing sprayer. Apply to saturation letting the first coat penetrate for 5-10 minutes. If applying a second coat, reapply in the same saturating manner wet-on-wet (applying the second coat before the first coat dries). Less material will be needed for the second coat. Roll or broom out any puddles until the sealer penetrates the substrate. If it starts to rain, stop treatment and cover the impregnated areas.
  • Notes

    Dry Time

    Typical drying time is 4-6 hours at 70°F and 50% relative humidity. Cooler temperatures or higher relative humidity can extend the drying time. Treated surfaces will be ready for pedestrian and vehicle traffic within 24 hours. Water repellency will continue to develop within 7 days of application.

    Clean Up

    Clean equipment and tools with xylene or mineral spirits. Unused or old material may be disposed of in a waste disposal site in accordance with local, state and federal laws.


    Avoid contact with skin, eyes and clothing, do not take internally. Use appropriate safety equipment during application and handling. Please refer to the safety data sheet (SDS) for additional precautionary instructions before use. For medical emergencies only, call ChemTrec (1-800-424-9300).

    Best Performance

    • Proper application is the responsibility of the user.
    • Will not inhibit water penetration through unsound or cracked surfaces with defective flashing, caulking or structural waterproofing.
    • Spills should not be allowed to sit for extended periods of time, clean all spills in a timely manner.
    • Make sure the most current versions of product data sheets and safety data sheets are being used.


    150 - 400 square feet per gallon (apply at a coverage rate to obtain the desired repellent effect). Variations in texture and porosity of substrate will affect the coverage and performance of the product.

  • FAQ

    What does wet-on-wet mean? Wet-on-wet means that the second coat is applied while the first coat is still wet. Two coats of the Siloxa-Tek 8510 are required wet-on-wet. The second coat is applied immediately after the first coat while the first coat is still wet, since the Siloxa-Tek 8510 is a hydrophobic product it will try to repel the second coat if the second coat is applied after the first coat has dried.

    Can I walk on the first coat to apply the second coat? Yes, you can walk on the first coat to apply the second coat. Since the Siloxa-Tek 8510 is a penetrating sealer it will dry invisible and will not show footprints.

    Can I paint after sealing? In order to continue repelling oils and staining we do not recommend painting over the Siloxa-Tek 8510.

    Does the concrete need to be dry before sealing? Yes, the concrete needs to be as dry as possible before sealing. We recommend the moisture content of the concrete be less than 4%wt. It is recommended to wait at least 24-48 hours after rain and pressure washing before sealing.

    What can I use to apply this product? The Siloxa-Tek 8510 can be applied with a 3/8" nap paint roller or a brush.

    How do I get oil stains out of my concrete? We recommend a highly concentrated, oil busting dish soap, such as Dawn. Squirt it over the stain and spread it around to cover the entire affected area. Let it sit for about an hour, then mop up the dish soap and oil with a paper towel.

    Where can I buy this product? The Siloxa-Tek 8510 is available through a number of distributors found on our distributor page.

  • Benefits

    • Composition - Supercharged, nanotechnology driven, proprietary isomers of silane with a proprietary fluorocarbon. Its smaller molecular structure allows for deeper penetration increasing performance.
    • Exceptional waterproofing - Penetrates deep within the concrete chemically reacting within the pores and capillaries creating a long-lasting hydrophobic surface that beads water
    • Resist staining from oil, grease & food exposure - Oleophobic fluorocarbon makes oil and grease easier to clean and remove from treated surfaces decreasing maintenance requirements
    • 100% breathable - Non-film forming. Allows moisture within the concrete to escape without adverse effects to the sealer. Does not trap moisture
    • Provides ease of maintenance - resists ASR / Alkali attack
    • Protects against chloride ion penetration - Forms an effective chloride screen dramatically reducing chloride ion ingress preventing deicing salt / chloride damage
    • Resists oxidization - Inhibits rust and corrosion of rebar in reinforced concrete by limiting substrates water absorption
    • Reduces moisture intrusion - Resists wind-driven rain, prevents freeze-thaw damage, spalling, pitting and cracking.
    • Resists atmospheric staining - Resists mold, mildew and efflorescence
    • Department of Transportation approved - Meets or exceeds DOT specifications
    • Improves durability - Prevents capillary uptake of water and the aggressive substances dissolved in it
    • Resists freeze thaw and thermal cycling damage
    • Natural flat finish - Does not change surface appearance, UV stable will not breakdown with light exposure
    • Can be applied to cured, honed and polished concrete - Ideal for horizontal surfaces exposed to pedestrian and vehicle traffic, compatible with silicate densifiers
    • Solvent based - Odorless, excellent for cold weather applications
    • Unrivaled industry leading 100 year warranty - Penetrates never delaminates, never diffuses, peel or flakes will not discolor yellow or degrade from UV light exposure.
    • Excellent penetration depth into any concrete, brick or masonry substrate.
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Product Comparisons

Uses Concrete, Masonry, Brick, Stone Concrete, Masonry, Brick, Stone
Chemistry Modified Silane/Siloxane Modified Silane/Siloxane
Carrier Solvent Water-Based
Finish Natural Natural
Color Clear Clear
Application Method Roller Sprayer, Roller
VOC Content 300 g/L 90 g/L