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CoverShield U140 Heavy Duty Oil Resistant Concrete Sealer-Gloss


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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 : Semi Gloss

CoverShield U140 Semi Gloss Heavy Duty Stain & Oil Resistant Concrete Sealer

How Can You Stop Oil From Staining Your Concrete

Concrete itself is a naturally porous material. It’s open. It has capillaries that solutions and contaminants can soak into.

To achieve oil resistant concrete you need to block those pores by applying a barrier, or some kind of repelling chemical to stop that oil from getting into the concrete.

There are 2 ways to do it:

1) It can be done with a film-forming sealer.
Something that will put a barrier across the surface, and stops the oil from getting into the concrete.

2) It can also be done with a penetrating sealer.
This product is resistant to oil, not just a water repellent sealer. Some examples would be our CoverSeal PEN 55 and Coverseal Premium. These products will soak into the concrete, and repel the oil from getting down into the surface.

Covertec Products’ popular film-forming sealer is called CoverShield U140.  It provides an absolute barrier, to stop oil from getting into the concrete.

It soaks into the sub-surface of the concrete, and leaves a thin film on the top that is:

  • Very oil resistant
  •  Highly fuel resistant
  •  Provides an absolute barrier.

With penetrating sealers, the surface is still open, so technically, oil can get into that top surface.  However, the CoverShield U140 provides a highly resistant barrier which would be the best way to stop oil getting into concrete.

What Is CoverShield U140 Semi Gloss Concrete Sealer

CoverShield U140 is a heavy duty oil resistant concrete sealer.  It’s a water-based, polyurethane sealer that is highly stain resistant and provides a very effective resistance to

  • Oil
  • Acid
  • Chemical stains.

We recommend using it mainly for interior applications such as:

  • Trowel finished concrete
  • Smooth concrete.

Typical areas include auto garage floors, workshops, pole barns, or factories.

The product has a lot of industrial applications, but it’s suitable for consumer-type situations as well.

Customers report using it successfully on residential garage floors, driveways, etc.

It can repel virtually any petroleum-based chemical or oil solution that might get into a concrete surface. It’s ability to repel oil, diesel and hydraulic fluid spills is unparalleled.

It’s also used on decorative concrete. It’s a sealer for protecting colors on stained concrete. Simply apply it after staining your surface and it will provide a highly oil resistant concrete sealer to the surface.

CoverShield U140 oil resistant concrete sealer also has strong industrial uses due to it’s ability to resist and repel:

  • Diesel
  • Hydraulic motor oils
  • Cutting oils.

In factories where cutting fluids and lubricating oils are used, it’s a challenge to prevent those chemicals from penetrating the slab.  CoverShield U140 has no problem repelling these from entering a concrete surface.

One of the benefits customers rave about with U140 is that the surface prep is insanely easy.

As long as the floor is clean and it’s absorbent (water will soak into it), you can apply CoverShield U140.

It’s the exact opposite of applying an epoxy coating that requires surface grinding or expensive prep.

While epoxy coatings provide oil and chemical resistance, you have to significantly grind the concrete down so it sticks to the floor.   You also have to apply a very thick layer of the epoxy to get the maximum protection.

CoverShield U140 provides extreme protection… but with a very thin coat. On top of that, because it’s very thin, it doesn’t lift and peel like an epoxy would.

CoverTec’s U140 oil resistant concrete sealer clearly offers contractors and DIY-ers more bang for the buck because it:

  • Requires very little surface surface prep
  • Provides higher a coverage area
  • Is extremely easy to application.

Warehouse Owner Erik T. Shares His Story About Using CoverShield U140

Is CoverShield U140 A Commercial Concrete Sealer

CoverShield U140 oil resistant concrete sealer was developed initially for commercial and industrial applications.
CoverTec Products has a long track record of success with this product in those environments because of its heavy duty oil and stain resistance.

A key factor of the U140’s success is that it doesn’t need extensive surface prep.

You don’t have to grind the floor aggressively.  As long as the concrete will accept a water (and the U140 can soak in), that is sufficient prep to use the product.

This ease of use allows us to make it available to consumer and DIY types of applications like:

  • Home garage floors
  • Personal workshops
  • Homeowner hobby shops
  • Etc.

These are great areas for homeowners to use CoverShield U140 on the interior.

On the exterior of the home, you can use it on:

  • A driveway
  • Stamped concrete
  • Stained concrete
  • An overlay
  • Etc.

This product used in these areas provide maximum resistance with a minimal prep.

What Are Typical Situations To Use CoverShield U140

Let’s look at some typical applications for CoverShield U140.

On the new construction side, it’s often applied to fresh concrete in:

  • A factory
  • A workshop
  • A garage floor
  • An auto shop.

In these cases, there’s a brand new floor and the surface will be exposed to all types of chemicals repeatedly. The last thing you want to do is stain that floor with oil hydraulic fluid.

If the objective is to protect that concrete from oil stains and chemical contamination, the U140 performs above and beyond.

It will soak into the concrete, put an absolute barrier on the floor, and keep chemicals from penetrating the concrete. And it doesn’t lift and peel like an epoxy would.

The thin coating the U140 provides is a very cost effective, but highly stain resistant solution.

Another typical situation where CoverShield U140 is used is on existing floors with oil contamination.

Slip and fall issues are always a problem in these environments. Maybe there’s a need to comply with local or federal laws from the EPA, OSHA or other regulatory bodies.

To protect that floor, you’ve got to clean it first, and then seal it to prevent further contamination.

Again, CoverShield U140 provides a thin and tough long-term protective barrier across the surface in these situations to prevent staining and minimize any safety issues.

The seal is so tough that it can hold up to forklift traffic, as well as the contaminants that may spill onto the floor.

EPA Rules, Factory and Safety, OSHA, Customers Or Workers

Another area of application for CoverShield U140 is on floors where it’s critical to keep them clean and safe for workers, customers or the public.

Situations like:

  • OSHA & EPA regulations
  • Potential contamination areas
  • Clean rooms
  • Safety areas.

In these environments, keeping the contaminants from soaking into the workshop or factory floor concrete is no problem for the U140.

It will keep those substances on the surface, and allow you to see them and clean them easily.

Best Applications For U140 Concrete Sealer

The most suitable applications for CoverShield U140 are:

  • Concrete floors
  • Smooth concrete
  • Trowel finished concrete
  • Machine finished concrete
  • Polished concrete.

For example, floors you’ll find inside a workshop, a factory, a garage and auto-body shop. In cases where the floor area is large square footage, laying down solutions like epoxy coatings can be very expensive. Aside from the hefty costs of an epoxy product, they also tend to lift and peel easily.

CoverShield U140 outperforms epoxy solutions in every way.

The product is very effective as an oil resistant concrete sealer. It is much cheaper, does not lift and peel, and it lasts several years. Not to mention that it has higher coverage, typically 800 square feet per gallon.

The minimal surface prep is also another reason why customers love the U140. So long as the floor is clean and absorbent, you can apply the product to the surface.

With two coats you get a very oil and stain resistant sealer that easily holds up against:

  • Diesel
  • Cutting oil
  • Motor oil
  • Gasoline
  • Hydraulic fluids
  • Jet fuel
  • Etc.

The U140 provides great stain resistance in environments where these contaminants threaten the safety and cleanliness for workers and the public.

With regard to exterior use situations, CoverShield U140 performs very well in places like:

  • Parking decks
  • Loading docks
  • Driveways
  • Access ways
  • Ramps.

The U140 is also UV-resistant, making outside applications an easy decision. So long as the concrete is smooth or dense, and passes the water test, it’s a perfect fit for your situation. You can also use U140 oil resistant concrete sealer on decorative and stamped concrete surfaces.

Important Note:

If you’re dealing with a rough or broom finish concrete surface, a penetrating sealer like CoverTec’s PEN 55 may be more appropriate. It’s also very oil and stain-resistant but works better in those highly textured environments.

What Makes CoverShield U140 Produce Better Results

The main advantages of CoverShield U140 over competing products include:


– Ease of application & minimal surface prep

The surface you’re working on doesn’t require extensive surface prep to use the U140… unlike other 3rd party sealers.
You can apply it over a smooth surface, WITHOUT any grinding, as long as that surfaces is absorbent and passes the water test.
If the surface is scratched in a local area after applying U140, you repair the area quickly and re-apply another coat.


– High chemical and oil resistance

CoverShield U140 oil resistant concrete sealer is a 2-part Urethane. It chemically reacts and provides a dense interlocked seal across the floor. It’s much more chemical resistant than a standard epoxy, Urethane or acrylic sealer. After soaking into the surface, it leaves a very thin film that’s highly oil and chemical resistant.


– It doesn’t lift and peel after application.

When you’re sealing a concrete slab, you must avoid lifting and peeling on the surface. The U140’s tough, thin seal doesn’t lift and peel like an epoxy or a standard coating typically will. Basically, it’s so close to the surface that it just doesn’t scrape off.

Things You Should Watch Out For With Big Brand Products

The problem with epoxy products is that in order to have a long lasting coat, you need to do extensive surface prep. You need to apply it fairly thick – 30 mils or above – in order to get a good seal or durable coating.

If you don’t do that, it will chip, lift and peel… and you’ll have extensive problems.

As such, it doesn’t have what I would call “sheet failure.” Ultimately, you’ll end up HAVING to re-coat the surface in a short period of time.

CoverShield U140 only requires the surface to be clean and porous. If water will soak into it, then so will the U140. The surface coverage using the U140 is a lot higher than the typical epoxy or big brand sealer.

Let’s talk about coverage.

If you’ve got a coating that’s only doing 200 – 300 square feet per gallon, your costs will be high.
Whereas the U140 – as a thin coat application – typically covers around 800 square feet per gallon. Clearly, there’s a tremendous difference in the coverage over the surface.

Another to understand is you’ll need to do repairs from time to time.

Every surface is subject to scratches and scrapes. In order to repair the damages to a floor sealed with the U140, it’s a matter of scrubbing the surface and re-applying it. This product bonds very well to itself.

With competing products, you’ll need extensive grinding, sanding or stripping of the surface just to re-apply that product.

All of this hassle – and unnecessary work – can be avoided if you’re using something like CoverShield U140. It’s a very, what we call sustainable coating.

Applying CoverShield U140 - Recommended Steps

When applying the U140, follow these simple guidelines.

The concrete needs to be clean. It needs to be absorbent in order to apply the product.

If you’ve got new concrete, it may require some densification. You can use a densifier like CoverTec’s SurfaceFinish CD80.

It’s a good Colloidal Silica Concrete Hardener to use prior to sealing the surface. That’ll give you an even harder surface to bond with, and increase the results of the sealing process.

Once the floor has been cleaned and densified, then you can apply the U140.

It’s best applied with a microfiber flat-mop. And you’ll typically get around 800 square feet of coverage per gallon. (You get very good coverage.)

At CoverTec, our customers use the term “thin to win.”

It’s all about thin coats. Two thin coats is the minimum requirement for any application.

You can also spray down the product, and then spread it thin. You can choose to pour it out on the surface, and then spread it around with a flat mop.

If you’re doing large areas, I would recommend using a 3/8th Nap rollerpreferably 18 inches wide. This way, you get more efficient production.

Each coat takes about 3 hours to dry. It depends on the temperature of the slab, but if you’re in the mid 70 degree range, it’s typically about 3 hours.

The product’s ready to use, so you don’t have to dilute it. You just mix the 2 parts together and spread it out on the surface. Wait 3 hours for the first coat to dry properly, then apply the second coat.

If you need more time between coats, no problem. You can apply the second coat the next day… actually up to 48 hours after the first application.

The U140 has what we call “a long re-coat window.” As long as the surface is clean, you can come back and re-apply it. It bonds very well to itself.

Here is something to watch out for:

If the temperature is low… everything takes longer. Once you’re below 70 degrees (Fahrenheit), the dry time can double. In extreme cases, you could need 6 to 12 hours before the first coat dries.

Important Note:

Make sure the first coat is completely dry before you apply the second coat.

Why Does CoverShield U140 Have A Shelf Life

CoverShield U140 oil resistant concrete sealer has a 12-month shelf life.

That’s because it’s a 2-part product. There’s an “A” side, and “B” side called the Catalyst. The Catalyst is sensitive to moisture.

If moisture gets into the Catalyst’s container, it will cause a reaction. It will generate little bubbles and a lower the viscosity (increase the thickness) of the material.

This thickness (as a result of out-gassing) will affect the final appearance and function of the U140’s film across the surface.

After about 12 months – if the U140 is not stored correctly – you might see this happen. Hence the reason for CoverTec’s shelf-life for the product.

In the case of using product beyond the 12-month shelf life and having been exposed to moisture, you might notice:

  • Seeing “pin holes” through the bubbles coming out.
  • You don’t get the same coverage as you normally would.
  • The applied product won’t have the same physical characteristics that you would that we expect (per our data sheets).

Does CoverShield U140 Interact Poorly With Other Products

CoverShield U140 oil resistant concrete sealer is designed to go on a porous surface, either inside or outside the property.

If there’s an existing coating on the surface, like an epoxy or a urethane, that is not a good application for the U140.

The only product that would be beneficial to apply to the surface prior to sealing with the U140 is a densifier.

CoverTec’s CD80 – which is a highly reactive – will soak into the concrete and harden the surface.

It acts as a moisture blocker, and provides a good surface on which you can use the U140.

As a rule:

CoverTec does not recommend using CoverShield U140 as a top coat to an existing sealer coat.

For more information on using this product, please contact us.


  • 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

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 Semi Gloss Photos

CoverShield U140 Semi Gloss Videos

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