Siloxa-Tek® 8500 Durable Concrete Coating

An industrial-grade, water-based, silane/siloxane engineered to reduce water and moisture intrusion, while protecting concrete or masonry substrates from chlorides and deicing 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
8500 Concrete Sealer Bottle Image

Project Calculator*

Siloxa-Tek 8500 Concrete Sealer marketing image

Description

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.

Applications

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.

Benefits

Provides

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

Prevents

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

Reduces

  • 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
Improvement

Water Vapor Transmission & Chloride Intrusion Percentage Improvement vs. Control

A
31%
B
35%
C
37%
D
43%
Siloxa-Tek® 8500
51%
Sealer Product

Auxilliary Information

  • Technical Specs

    • Feature: Water & salt repellent
    • Chemistry: Silane/Siloxane
    • Color: Clear
    • Finish: Invisible
    • Category: Penetrating
    • Carrier: Water
    • Packaging: 1 Gallon, 1 Gallon Ultra Concentrate
    • Coverage: Ready to Use: Up to 250 sq. ft. per coat, Ultra Concentrate: Up to 1250 sq. ft. per coat
    • Reconstitution Ratio: Ultra Concentrate: 1 part sealer : 4 parts water (distilled water is recommended)
    • Interior/Exterior: Interior/Exterior
    • Application Method: Sprayer, Roller, Brush
    • Application Temperature: 40 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: Soap/water
    • Paintable: Yes, oil or enamel based paint, first test for compatibility
    • VOC Content: 90 g/L
  • 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® 8500 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. Siloxa-Tek® 8500 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. May be applied to slightly damp surfaces, although maximum penetration is achieved on dry substrates. The surface-zone moisture content of the concrete should not exceed 4% wt. Do not apply if standing water is visible.
    2. Surface and air temperatures must be at least 40°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.
    3. Crack, patching and expansion joint sealants can be applied before or after application; always test for compatibility and adhesion.
    4. Protect people, property, vehicles, window glass, roofing materials, plastic products, shrubbery, landscaping and all surfaces not set for treatment from overspray.
  • Ready to Use

    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. Two wet-on-wet coats are needed to ensure complete coverage. Apply with a roller, brush or low-pressure non-atomizing sprayer. Apply to saturation and let the first coat penetrate for 5-10 minutes then reapply a second coat in the same saturating manner. 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.
  • Ultra Concentrate

    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. Always mix the concentrate with 4 parts water prior to application. Distilled water is recommended for maximum performance. Stir material throughly before and during application.
    3. Two wet-on-wet coats are needed to ensure complete coverage. Apply with a roller, brush or low-pressure non-atomizing sprayer. Apply to saturation and let the first coat penetrate for 5-10 minutes then reapply a second coat in the same saturating manner. 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, tools and surfaces with hot soapy water. Unused or old material may be disposed of in a waste disposal site in accordance with local, state and federal laws.

    Precautions/Safety

    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.

    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.

    Coverage

    1 coat: 150 - 400 square feet per gallon. 2 coats: 75 - 200 square feet per gallon. Variations in texture and porosity of substrate will affect the coverage and performance of the product.

  • Testing

    NCHRP 244 Report Series II Reduction in Water Absorption: 1 day: 82%; 5 days: 81%; 21 days: 77%; Average 80% Reduction in Chloride Ion Content: 1 day: 79%; 5 Days: 83%; 21 days: 86%; Average 83%

    NCHRP 244 Report Series IV Southern Exposure Accelerated Weathering Test Resistance to UV Light : No discoloration Reduction in Soluble Chloride: 93% reduction in soluble chloride

    ASTM E 514-86 Water Penetration and Leakage Through Masonry: 90% reduction in leakage rate

    ASTM E 96-95 Water Vapor Transmission: Up 3 (Untreated 3.5) Down 2.5 (Untreated 3.3)

    ASTM C 672-92 Scaling Resistance to Deicing Chemicals: Control: 40 cycles; After treatment: 80 cycles

  • 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 8500 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 8500 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 8500 is a penetrating sealer it will dry invisible and will not show footprints.

    Can I paint after sealing? Yes, you can paint after applying the Siloxa-Tek 8500 as long as an oil or enamel based paint is used. Since the Siloxa-Tek 8500 is a hydrophobic sealer it will repel any latex or water based paints.

    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 is the difference between Siloxa-Tek 8500 ready to use and Siloxa-Tek 8500 ultra concentrate? The Siloxa-Tek 8500 is available in a ready to use gallon or an ultra concentrated gallon. The ready to use gallon is ready to use right out of the container and requires no mixing with water. The ultra concentrated gallon is mixed with 4 gallons of water to make a 5 gallon bucket of sealer. The ready to use gallon will cover up to 250 square feet per gallon per coat. The ultra concentrated gallon will cover up to 1250 square feet per container per coat. If you have a large amount of square footage the ultra concentrated gallon is a great option.

    What do you mix the concentrate with? The Siloxa-Tek 8500 ultra concentrate is mixed with water. 1 gallon of Siloxa-Tek 8500 ultra concentrate is mixed with 4 gallons of water.

    How do I mix the Siloxa-Tek 8500 ultra concentrated product with water? The Siloxa-Tek 8500 ultra concentrate is a concentrated product that needs to be mixed with water prior to application. Pour the 1 gallon of Siloxa-Tek 8500 into a 5 gallon bucket. Next add 4 gallons of water into the 5 gallon bucket. Mix the water and 8500 mixture well. You can then pour the mixture into a sprayer to spray apply, or you can dip a nap paint roller into the bucket and roll apply.

    How many gallons do I need to treat 1250 square feet? The Siloxa-Tek 8500 is available in a ready to use gallon or an ultra concentrated gallon. The ready to use gallon will cover up to 250 square feet per gallon per coat. The ultra concentrated gallon will cover up to 1250 square feet per container per coat. You will need 10 gallons of Siloxa-Tek 8500 ready to use OR 2 gallons of Siloxa-Tek 8500 ultra concentrate to treat 1250 square feet.

    What can I use to apply this product? The Siloxa-Tek 8500 can be applied with a garden variety pump sprayer, 3/8" nap paint roller or a brush.

    How do I clean out the sprayer after sealing? Since the Siloxa-Tek 8500 is a water based product you can use regular soap and water to clean out the sprayer and other application tools.

    Where can I buy this product? The Siloxa-Tek 8500 is available through a number of distributors found on our distributor page.

  • Related Articles

Subscribe for more Ghostshield videos:

Product Comparisons

siloxa-tek-8500
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