Penetrating Water & Salt Repellent  Siloxa-Tek^® 8500

Product Details

• Benefits
  • Excellent waterproofing - Penetrates deep within the concrete chemically reacting within the pores and capillaries creating a long-lasting hydrophobic surface that beads water
  • 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
  • Protects against chloride ion penetration - Forms an effective chloride screen dramatically reducing chloride ion ingress preventing deicing salt / chloride damage
  • Reduces moisture intrusion - Resists wind-driven rain, prevents freeze-thaw damage, spalling, pitting and cracking.
  • Resists organic growth - Resists mold, mildew, lichen, and efflorescence
  • Department of Transportation approved - Meets and 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
  • Water based - Low VOC’s, environmentally friendly
• Application

  Surface 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.

  Application - 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.

  Application - 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.

  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.

• Technical Documents
  • Technical Data Sheet (TDS) (PDF, 5,566k)
  • Application Instructions (PDF, 88k)
  • Safety Data Sheet (SDS) (PDF, 150k)
  • Specification - 071900 (DOC, 119k)