skip to Main Content

CoverShield U140 Heavy Duty Stain and Oil Resistant Clear Concrete Sealer – Matte Finish

clear concrete sealer matte finish


Change Selection

Shipping : FREE on all orders above $20 in the continental US

Location : Interior/Exterior
Task : Floors
Application : Pump Sprayer, MIcrofiber Mop, T-Bar, Roller
Surface : Concrete, Terrazzo, Natural Stone
Base : Water Based Urethane
Drytime : 3 Hrs at 75 deg F
Coverage : 800 sq.ft/ gallon (19 .6 sq.m/l)
Finish : Matte

Two-component, water-based polyurethane clear concrete sealer. Highly resistant to oils and chemicals and heavy traffic. . Natural look matte finish. Cost-effective solution for auto shops, warehouses, pole barns, and factory flooring.

CoverShield U140 Matte Heavy Duty Stain & Oil Resistant Concrete FloorSealer


  • Scratch resistant
  • Oil and stain resistant
  • Odorless
  • UV stable
  • Easy to apply
  • Chemical resistant
  • Waterproof
  • Excellent abrasion resistant

Typical Uses

  • Industrial floors
  • Parking decks
  • Workshops
  • Walkways, stairways
  • Counter tops
  • Driveways

Shelf Life

12 months when stored at 77°F (25°C) or less in a dry and shaded area. Protect from freezing.

Theoretical Coverage

Approximately 800ft2 /gallon (19.6 m2 /liter) per coat depending on the density and porosity of the substrate.

Frequently Asked Questions

How does U140 work?

CoverShield U140 is a tough, industrial grade, water based clear gloss or matte finish polyurethane sealer. We use  a low viscosity highly crosslinked advanced blend of polyols resins in a water-based formulation.  When these resins react together the thin film formed, that is highly resistant to oil and automotive fluids, acids, alkaline solutions, solvents, food stains and cleaning agents. U140 is designed to penetrate the subsurface of the concrete and form a thin film on the top surface which provides an absolute barrier to oil.  This thin film is non yellowing, does not lift and peel (like thicker coatings) and is easy to keep clean repair and recoat.

How does CoverShield U140 compare to a penetrating sealer?

Our product is an aliphatic polyurethane.  It forms a  thin film across the surface of the concrete that is and absolute barrier to oil and  harmful chemical staining.

Penetrating  sealers do not form a film at the surface. The work by blocking the pores in the concrete and restricting the oil and other contaminates getting into the sub surface of the concrete.  The very top surface is still exposed however so staining is still possible and there are limitations to the amount of oil exposure the penetrating can withstand.

How does CoverShield U140 compare to an epoxy coating?

CoverShield U140 creates a thin, highly durable layer on the surface of the concrete that is very oil resistant.  The product that resists peeling and scratching, holds up heavy foot and forklift traffic. Furthermore, U140 matte or gloss finish is UV resistant and can be used interior and exterior.

U140 does not require extensive surface preparation in order to bond to a smooth surface.  This makes the product very effective on smooth   steel troweled, densified or polished concrete. The high coverage per gallon.( 800 sq. ft /gal or greater)  compared to 150 -200 sq. ft per gal for an epoxy coating .  This makes the U140 a high-performance high value solution.  A lot of bang for the buck!

Epoxy coatings have excellent oil and chemical resistance but are not UV resistant and are for interior use only.  Application thickness is higher and surface preparation needs are greater for an epoxy . This drives up the overall cost of and epoxy coating compared to the CoverShield U140.

Is CoverShield U140 Shiny?

U140 comes in two sheens, Semi-Gloss, and Matte. The matte is a flat no shine finish.  The semi-gloss has a medium gloss appearance. The gloss level can be increased by applying a prime coat first and/or densifying the concrete using our SurfaceFinish CD80 product.  U140 can also be burnished with a high-speed burnishing pad to increase the gloss. To increase gloss by burnishing, wait at least 24 hours after the final coat is applied. Then use a high-speed burnisher (1500–2500 RPM) fitted with 800, 1500 and 3000 diamond grit burnishing pads, or Hog Hair pads. Start with 800 grit and burnish at a fast walking pace.

Can I color the floor first?

For best results we recommend staining the concrete first using our color stain UV products.  The ColorStain UV can also be added directly to U140 to impart color in a single step.

Should I use a concrete Densifier?

The use of a concrete densifier depends on the quality and strength of the concrete. Densifying the concrete can harden the concrete and increase overall sealer adhesion and durability.  Densifying can also help with increase shine.   We recommend the use of  our Surface Finish CD80. This product is a colloidal silica with very small  particle size (3 to 8 nanometers).  These nanoparticles mean that the densifier penetrates deeper and reacts faster (30 to 60 minutes) than standard concrete hardeners.   SurfaceFinish CD80 is supplied in a concentrate (1 gal makes 4 gals ready to use) so it is very economical.

Is the Product chemical resistant?

Yes, U140 is very chemical resistant to a variety of substances you would see in a garage setting, for example brake fluid, oil, acid, bleach, salts, etc. We use  a low viscosity highly crosslinked advanced blend of polyols resins in a water-based formulation.  When these resins react together the thin film formed  is highly resistant to oil and automotive fluids, acids, alkaline solutions, solvents, food stains and cleaning agents.

A major benefit of the CoverShield U140 is that it is a thin film system.  It penetrates the  sub surface and leaves a thin film on top of the concrete. This film is very oil resistant and makes concrete easy to clean and maintain.  Also, it does not  flake and peel like epoxy.

How long does it last?

This depends on the amount of use, type of use, chemical exposure, and of course how well the finished surface is cleaned and maintained. Typically, you should expect to 3 to 5 years before having to do a recoat.  Based on foot and vehicular traffic, floor should be swept clean with broom or a microfiber dusting pad.

In a workshop environment or where there is heavy vehicular traffic, floor surface should be mopped daily or cleaned with a floor machine using a neutral cleaning solution.

Will it scratch?

Yes, All coatings will scratch, no coating is total scratch proof!

Having said that U140 is a very durable sealer and has a high scratch resistant.  If the surface does get scratched it is easy to repair.   Sand the damaged area with 400 grit sandpaper. The aim is to feather out the scratch and prepare the repair area for to coating. Then wipe up the dust using neutral cleaner or rubbing alcohol.  The repair area needs to clean dull and dry. When dry apply 2 or 3 thin coats of U140 .  Allow 24 -48 hours before opening to vehicular traffic depending on temperature and humidity.

Is it easy to apply?

Yes, U140 is simple to apply. On a smooth trowel finished concrete you simply spray the first coat using a pump-up sprayer, and then use a flat microfiber mop and spread a nice even thin coat. Allow the first coat to dry before applying the 2nd coat.  The 2nd coat should be applied in the same manner as the 1st.

If the surface is polished (maximum 800 grit ) or very dense we recommend you apply a prime coat first.  Apply the prime coat by pump up spray only.  No mopping.

If the surface is  very textured uneven or broom finished, then a U140 should be applied by 3/8th nap microfiber roller. Please refer to the technical datasheet for more in depth application instructions.

How long does it take to dry?

Light foot traffic is possible after 6-8 hours and heavy foot traffic is possible after 12 hours at 77deg F (25 deg C) and 50% humidity. Dry time is very dependent product thickness, temperature and humidity.  The higher the temperature and humidity the faster it will dry. If the slab is cold and the air is dry the dry time will be significantly extended.  It is very important to allow each coat ( including primer cost if used) to dry fully  before applying the next coat (topcoat). That way the whole system will dry faster. When the last coat is tack free Allow a further 24- 48 hours before vehicular traffic depending on application thickness, the temperature and the relative humidity in the room.

What condition should the concrete be in before I coat?

The concrete surface being coated must be a minimum 7 days cured, structurally sound (200psi or greater according to ASTM D4541), clean and dry. It must have low moisture-vapor transmission (6 lbs./1,000 ft ²/24 h (or 15 g/m²/24 h) or lower).

It is very important to make sure that the concrete is absorbent. Any existing sealer or curing agent etc. that might interfere with the absorption of the u140 sealer should be removed.  A quick test for existing sealers is to conduct a water test to see if the concrete will darken when wet.  Simply pour 1 fl.oz of water on the concrete and see if it will darken the surface after standing for 5 minutes.  If after 5 minutes the surface does not darken prepare the surface by sanding the floor with a 60-200 grit sanding screen or diamond abrasive pad. Remove all residue before sealing.

Is the pot life important?

Yes, the pot life is very important.  The pot life is basically the amount of working time you have  to apply the product once the product is mixed.  CoverShield U140  has a 2 hours pot life at 77deg F (25 deg C). Any remaining  after that point must be thrown away. Using product once in its past its pot life will result in product failure.

Can I recoat CoverShield U140?

If the surface is clean you can recoat with CoverShield U140 within the first 48 hours of previous application. After 48 hours, sand or scrub entire surface using After 48 hours, mechanically abrade the entire surface using an auto scrubber fitted with a 220-sand screen or a Marron Surface Preparation Pad (SPP pad). Clean with GlossClean neutral cleaner and allow substrate to dry. Apply CoverShield U140 within one hour.

Can I use the CoverShield U140 Floor Coating outside?

Yes, CoverShield U140 is a UV resistant non yellowing polyurethane coating and can be used exterior and interior applications.

Does the floor get slippery?

CoverShield U140 has good anti slip properties when dry but it can get slippery when wet on a smooth surface.  Increase slip resistance can be achieved by mixing in our CoverGrip anti slip additive at the time of application.

How many square feet will a full kit cover?

Approximately 800ft2/gallon (19.6 m2/liter) per coat depending on the density and porosity of the substrate. Coverage can be higher on the 2nd coat. The important thing is not  to over-apply. This product should be applied thinly and evenly.

Can U140 be used for other surfaces other than concrete?

CoverShield U140 is recommend for use on concrete and terrazzo surfaces only.  These include steel trowel, polished concrete( up to 800 grit) .  U140 is not recommended for non-porous surface like epoxy, polyurethane or ceramic and porcelain.

Can You Apply U140 Over Epoxy?

No, if you are going to use epoxy, then you would use our product called StrongSeal Plus.

Can You Apply U140 Over Acrylic Paint?

No, if you have an acrylic product on your floor, you must strip this product first, then apply the U140.  Alternatively, you can use StrongSeal Plus.

Can You Paint Epoxy Over U140?

Yes, if the U140 is sanded to create a profile, you could then coat with an epoxy product.

What are the cleaning and maintenance procedures?

Based on foot and vehicular traffic, the floor should be swept clean with broom or a microfiber dusting pad.

In a workshop environment or where there is heavy vehicular traffic, the floor surface should be mopped daily or cleaned with a floor machine using a neutral cleaning solution.

CoverShield U140 Matte Photos

CoverShield U140 Matte Videos

Back To Top