Concrete Sealer

Stains no more

We took our favorite all-around, concrete sealer and made it even better. Take all the best attributes of 8500 - resists water intrusion, deicing salts and chlorides and add to it resistance from staining making it even better for driveways, shop floors and garages. This water-based product makes oils & grease clean up easier.



1 Gallon: $89.88

1 Gallon Concentrate (Makes 4 Gallons): $329.88



Stains no more

We took our favorite all-around, concrete sealer and made it even better. Take all the best attributes of 8500 – resists water intrusion, deicing salts and chlorides and add to it resistance from staining making it even better for driveways, shop floors and garages. This water-based product makes oils & grease clean up easier.

Additional information

Weight N/A

What it is

Penetrating, water-based, water, salt and oil resistant concrete sealer

What it's for

Concrete floors, concrete driveways, garages, shop floors and patios, brick, stone & masonry

What it does

Waterproofs and seals concrete & masonry, resists deicing salts and makes oil and grease clean up easier

What it's made of

Water-carried silanes, siloxanes, proprietary stain repellent additives

clean, dry concrete

Free of spalling, cracking and pitting

What's the finish/color

Clear, flat, natural

How do you apply it?

Sprayer, roller or brush

What's so special about it

Available in a ready to use formulation this cost-effective product resists deicing salts and makes stains easier to clean while waterproofing concrete

What else is like it?

Siloxa-Tek 8500: Resists deicing salts and water but will not resist staining
Siloxa-Tek 8510: Solvent-carried and higher performing version of the 8505


Photos and videos of Ghostshield concrete sealers in action


Technical specs, application instructions, testing data


Siloxa-Tek 8505 meet 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


  • Composition - Nanotechnology driven high-performance isooctyltriethoxysilane and proprietary fluorocarbon. Its smaller molecular structure allows for deeper penetration increasing performance
  • Excellent waterproofing - Penetrates deep within the concrete chemically reacting within the pores and capillaries creating a long-lasting hydrophobic surface that beads water
  • Makes staining from oil, grease & food exposure easier to clean - 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.
  • 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 atmospheric staining - Resists mold, mildew, lichen, efflorescence and dirt pick up
  • 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 concrete - Ideal for horizontal surfaces exposed to pedestrian and vehicle traffic, compatible with silicate densifiers
  • Water based - Low VOC’s, environmentally friendly
  • Unrivaled industry leading 100 year warranty - Penetrates never delaminates, never diffuses, peel or flakes will not discolor yellow or degrade from UV light exposure.


  • Feature: Water, salt, oil & stain repellent
  • Chemistry: Modified Silane/Siloxane
  • Color: Milky white, dries clear
  • Finish: Invisible
  • Category: Penetrating
  • Carrier: Water
  • Packaging: 1 Gallon
  • Coverage: Ready to Use: Up to 250 sq. ft. per coat
  • Interior/Exterior: Interior/Exterior
  • Application Method: Sprayer, Roller, Brush
  • Application Temperature: 40ºF - 95ºF
  • 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: No
  • VOC Content: 90 g/L


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® 8505 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® 8505 oil repellent sealer is a small investment that leads to long-term savings and improved performance.



  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 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.
  4. Crack, patching and expansion joint sealants can be applied before or after 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.


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.


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.


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.


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.


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 8505 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 8505 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 8505 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 8505

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.

How many gallons do I need to treat 250 square feet? The ready to use gallon will cover up to 250 square feet per gallon per coat.  You will need 2 gallons of Siloxa-Tek 8505 ready to use.

What can I use to apply this product? The Siloxa-Tek 8505 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 8505 is a water based product you can use regular soap and water to clean out the sprayer and other application tools.

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 8505 is available through a number of distributors found on our distributor page.

The Siloxa-Tek 8505 dried tacky and sticky, what happened and how do I fix it? If over applied or applied past the point of the concrete's absorption the excess sealer material will dry on the surface leaving the concrete feeling tacky/sticky. In order to remediate this issue use a mixture of ammonia and water (typically 4 oz of ammonia : 1 gallon water ratio) and spray it on the concrete, wipe or broom the surface working in the mixture on the tacky/sticky areas.

Ghostshield in action

Recent project videos showing how to seal your concrete with Ghostshield


Our latest project in Florida was for the beautiful new Caoba Apartments, part of the new Miami Worldcenter. Ghostshield was the perfect sealer for their high-traffic parking garage.

432 Park Avenue New York

432 Park Avenue - the tallest residential building in the Western Hemisphere - sealed with our flagship commercial product, Iso-Tek 8501; a thixotropic sealer.


View the Micro-Degreaser 1100 a non-acid-based, non-toxic cleaner and the Siloxa-Tek 8510 a deep-penetrating oil and salt repellent sealer in action.