Concrete COATING

Top of its class

This urethane concrete coating repels chemicals and resists abrasion. Best used as a top coat to the Epoxy 325 primer. Available in clear or wide variety of colors.



1.5 Gallon Kit | Clear: $209.88 | Color: $219.88

3 Gallon Kit | Clear: $399.88 | Color: $419.88

Slip Resistant Additive: $34.88

Aluminum Oxide 46 Grit Quart: $49.88

Aluminum Oxide 60 Grit Quart $49.88

Final Sale

*The Urethane 645 cannot be shipped to California. In order to ship to California use the California compliant version: Urethane 645 CA.



Top of its class

This urethane concrete coating repels chemicals and resists abrasion. Best used as a top coat to the Epoxy 325 primer. Available in clear or wide variety of colors.

What it is

Solvent-based, high-gloss, two component aliphatic urethane floor coating

What it's for

Indoor garage floors, shop floors, warehouses, kennels

What it does

Coats and protects concrete with a tough, chemical resistant high gloss finish. May be slippery when wet so use with a slip resistant additive or aluminum oxide

What it's made of

High quality aliphatic urethane resins


Durable, abrasion resistant protection

What's the finish/color

Clear or color, high-gloss

How do you apply it?

3/8" nap epoxy glide roller

What's so special about it

Used only on indoor applications this product will Stop dusting, repel oils/grease, chemicals, acids and resist abrasions all while protecting the epoxy primer beneath.

What else is like it?

Epoxy 325: A semi-gloss epoxy primer applied prior to the 645
Wear-Tek 4400: A one component urethane also leaving a high gloss finish that can be used on indoor or outdoor applications


Photos and videos of Ghostshield concrete sealers in action


PDF downloads, technical specs and graph

Urethane 645 rises above

Urethane 645 meets or exceeds the following tests:

ASTM D-1308: Chemical Resistance

ASTM D-3363: Film Hardness

ASTM D-4541: Pull-Off Strength

ASTM D-4060: Abrasion Resistance

ASTM D-2794: Impact Resistance

ASTM D-3359: Adhesion


  • Feature: Durable Coating
  • Chemistry: Aliphatic Urethane
  • Color: Clear, tile red, beige, medium gray, light gray, off white, white
  • Finish: High gloss
  • Category: Coating
  • Carrier: Solvent
  • Availability: 2 component kit
  • Packaging: 1.5 Gallon Kit, 3 Gallon Kit
  • Coverage: 350 sq. ft. per gallon at 3-5 mils wet film thickness
  • Interior/Exterior: Interior
  • Application Method: Roller/brush
  • Application Temperature: 55-90 degrees F with relative humidity below 75%
  • Number of Coats: 1
  • New Concrete: Yes, at least 28 days after being poured
  • Storage/Shelf Life: 1 Year
  • Clean up: Ketone solvents
  • VOC Content: 335 g/L
  • Hardness: Shore D 65
  • Impact Resistance: 160 in/lb
  • Abrasion Resistance: 20 mg
  • Adhesion: 350 psi
  • Viscosity: 400 cps
  • Primer: Epoxy 325


  • Pot Life – 1.5 - gallon volume: 2-4 hours
  • Tack Free (dry to touch): 3-5 hours
  • Recoat or Topcoat: 5-9 hours
  • Light Foot Traffic: 14-24 hours
  • Full Cure (Heavy Traffic): 3-5 days


  • 10% Sodium Hydroxide: Long Term Immersion
  • 10% Sulfuric: Short Term Immersion
  • 10% Hydrochloric Acid: Long Term Splash Spill
  • 20% Nitric Acid: Short Term Splash Spill
  • 50% Sodium Hydroxide: Short Term Immersion
  • Acetic Acid 5%: Short Term Immersion
  • Ethylene Glycol: Short Term Immersion
  • Gasoline: Short Term Immersion
  • Mek: Not Recommeded
  • Methyl Alcohol: Short Term Splash Spill
  • Xylene: Short Term Immersion


  1. The concrete substrate to be coated must be clean, dry, and completely free of loose particles, grease, oil, or any substance that would interfere with proper bond.
  2. Surface and air temperatures must be at least 55°F during application. Surface and air temperatures should not exceed 90°F. Keep material from freezing.
  3. The surface-zone moisture content of the concrete should not exceed 4% wt. A test should be made to determine that the concrete has an appropriate vapor barrier. This can be done by placing a 4’X4’ plastic sheet on the substrate and taping down the edges. If after 24 hours, the substrate is still dry below the plastic sheet, then the substrate does not show signs of eventual hydrostatic pressure problems that may later cause disbanding.
  4. For a one or two coat thin build system (3-10 mils dry) we recommend either mechanical scarification or acid etching until a suitable profile is achieved. For a complete system build higher than 10 mils dry, we recommend a fine brush blast (shot blast). If acid is used to clean the concrete, neutralize the surface completely and rinse it with water prior to application. Then wait for the concrete to dry out for at least 24-48 hours.



This product comes pre-packaged by weight. Kits should be mixed in their entirety. This product has a two to one mix ratio by volume- merely mix two gallons of part A with 1 gallon part B. Urethane 645 A and Urethane 645 B should be thoroughly mixed before combining. Scrape the bottom and sides of each container. Urethane 645 A and Urethane 645 B can then be combined (Urethane 645 is sold as a pre-packaged kit and Urethane 645 Part A should be mixed in its entirety with Urethane 645 Part B). After the two parts are combined, mix well with slow speed mixing equipment such as a jiffy mixer until the material is thoroughly mixed and streak free. Avoid whipping air into the coating. Improper mixing may result in product failure.


Test the sealer in an inconspicuous area to ensure the desired coverage and appearance is achieved. The mixed material can be applied by brush or roller. Workable time is about 3 hours. Maintain temperatures within the recommended ranges during the application and curing process. Properly prime the substrate with the Epoxy 325. It is best to maintain a wet edge to avoid roller marks. Direct sunlight or high temperatures may cause visible roller marking during application. Too thick of an application may result in product failure. Exposure to certain types of lighting such as sodium vapor lights may cause the product to discolor. Applications with relative humidity higher than 90% and/or poor air circulation may cause improper cure and surface tackiness. When the end of the pot life has been reached, you will find that the material becomes hard to apply and will actually tend to roll back up onto the roller. Do not try to continue application when the coating has reached this step. Applications made at different times with differing environmental conditions, may show slight variations in gloss. Coverage is approximately 350 sq. ft. per gallon. Make sure you test the surface for dryness prior to use and allow at least 14 hours before walking. A full cure will take up to 5 days to complete.


Multiple coats of this product are acceptable. If you opt to recoat this product, you must first be sure that all of the solvents have evaporated from the coating during the curing process. It is best to test the coating before recoating or topcoating. This can be done by pressing on the coating with your thumb to verify that no fingerprint impression is left. If no impression is created, then the recoat can be started. Always remember that colder temperatures will require more cure time for the product before recoating can commence. Before recoating or topcoating, check the coating to insure no contaminants exist. If a blush or contaminants are present on a previous coat, remove with a standard detergent cleaner. When recoating this product with subsequent coats of the urethane, it is advisable to apply the recoat before 24 hours passes. Also, it is advisable to degloss the previous coat to ensure a trouble free bond.


  • Restrict the use of the floor to light traffic and non-harsh chemicals until the coating is fully cured. It is best to let the floor remain dry for the full cure cycle. Dependent on actual complete system application, surface may be slippery, especially when wet or contaminated; keep surface clean and dry.
  • Some cleaners may affect the color of the floor installed. Test each cleaner in a small area, utilizing your cleaning technique. If no ill effects are noted, you can continue to clean with the product and process tested.
  • Colors or clarity for clear may be affected by high humidity, low temperatures, or chemical exposure.
  • For best results use a high quality 3/8” nap roller.
  • Slab on grade requires moisture barrier.
  • Substrate temperature must be 5°F above dew point.
  • All new concrete must be cured for at least 28 days.
  • Colors may vary from batch to batch, therefore, use only product from the same batch for an entire job.
  • Improper mixing or too thick of an application may result in product failure.
  • Light or bright colors (white, etc.) may require multiple coats or a suitable color coordinated primer to achieve a satisfactory hide.
  • Tire contact may cause discoloration or staining.

Clean Up

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


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.
  • Make sure the most current versions of technical data sheets and safety data sheets are being used.
  • Keep out of reach of children and pets.
  • Store in a cool, dry place away from direct sunlight. Avoid opened containers, as moisture will cure the material.


350 square feet per gallon. Variations in texture and porosity of substrate will affect the coverage and performance of the product.

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.