Return to previous page
  • Overview
  • Specs
  • Coverage Rate
  • Cure
  • Chemical
  • Application
  • Video

E903UCB Cove Base Urethane Mortar  

E903UCB is a bio-based three or four component (dependent on color) trowel applied urethane Cove Base kit that has outstanding wear performance and can withstand higher heat exposures (250F) than typical unmodified urethanes.  The product can withstand thermal shock, impact, abrasion and chemical exposures. The E903UCB is resistant to fungi growth per the industry standard ASTM G-21. E903CB is designed as a heavy duty coving mortar for creating a cove base, cant cove and other vertical applications for use in commercial kitchens, restrooms and locker rooms, food prep areas, and food and beverage facilities.

Available in 3 color options, Gray, Tan & Red and 2 kit sizes, 35 lb and 18 lb.

The 35 lb kit covers 35 linear feet for a 3/16″ x 4″ cove base. Each 35 lb kit has Part A, Part B and aggregate Part C (2.5# part A in a container, not full + 2.5# part B in a container not full + 1 bag blended CB aggregate at 28.5# (weights approximate) and 1 bag of colored powder pigment in the color desired, typically 0.5# per bag Application thickness depends on project requirements.  Typical thickness E903UCB is 3/16″ thickness.

PRIMER: None required.  Suggest using the NP-1 liquid only option as primer and apply E903UCB when tacky.

TOPCOAT: None required

Where is E903UCB Vertical Cove Base Urethane Used?

  • Any vertical surface requiring a Cove finish
  • Commercial kitchens, Food Prep Areas
  • Food & Beverage facilities
  • Restrooms & Locker Rooms

Why E903UCB Cove Base Urethane?

  • Easy construction of vertical cove bases
  • Seamless hygienic finish with no grout lines
  • Resistant fo fungi growth
  • Low odor, fast installation, fast cure
  • Thermal shock to 250F & chemical resistance
  • 3 color options


Solids 98% (liquids mixed with aggregate
VOC 5 g/L
Colors  Gray, Tan, Red
Recommended Film Thickness Final film thickness varies, dependednt on concrete conditions and system used.  Typieal finished thickness 3/16″ for a vertical cove base
Coverage Rate  35 lb kit yields 35 linear feet/kit for a 3/16″ x 4′ cove base and 18 lb kit yields 18 linear feet
Packaging/Mix Ratio Each kit has Part A, Part B and aggregate Part C.  The 35 lb kit has (2.5# part A in a container, not full + 2.5# part B in a container not full + 1 bags blended CB aggregate at 28.5# (weights approximate) and 1 bag of colored powder pigment in the color desired, typically 0.5# per bag
Shelf Life 6 months in unopened container
Heat Resistance Can withstand up to 250F degrees
Bond Strength 100% concrete failure @ ASTM D-4541
Impact Resistance 160 in lbs@ ASTM D-4226
Hardness Shore D=80 typical
Flexural Strength 1,900 psi @ASTM C-580
Compressive Strength 5,800 psi @ASTM C-579
Tensile Strength 900 psi @ASTM C-307
Resistant to Fungi Growth Passes rating of 1 @ASTM G-21
Viscosity When mixed it forms a trowelable paste


Coverage Rate  35 Lb Kit Yields 35 Linear Feet/Kit For A 3/16″ X 4′ Cove Base And 18 Lb Kit Yields 18 Linear Feet


Pot Life – 15 min
Light Foot Traffic 12 hours
Heavy Foot Traffic 24 hours
Full Cure 7 days

APPLICATION TEMPERATURE: 40-85 degrees F with relative humidity below 85%


Spot testing per ASTM D1308 for Mustard, Ketchup, Lactic Acid, Vinegar, and Lemon Juice wer performed and no physical damage to the exposed surface was observed. In 24 hour immersion testing, the following results were observed

acetic acid 10% passed
xylene passed
30% nitric passed
Sodium hydroxide 50% passed
Sodium hydroxied 30% passed


PRODUCT STORAGE: Store product in an area so as to bring the material to normal room temperature before using. Continuous storage should be between 60 and 90 degree F. Keep from freezing.

SURFACE PREPARATION: All dirt, oil, dust, foreign contaminants and laitance must be removed to assure a trouble free bond to the substrate. We recommend that an aggressive shot blast be performed prior to the application of this product. A less adequate method would be acid etching, but the etch should properly profile the substrate. All edges and around columns or beams should be mechanically scarified. All termination points should not be feather edged, but should be saw cut with the termination ending at the sawcut or blended into an applied epoxy floor overlay. All large cracks should be V cut and filled with appropriate crack filler. All expansion joints should be filled with appropriate joint filler. When overlaying an expansion joint, a single saw cut through the epoxy overlay will prevent random fracturing. A test should be made to determine that the concrete is dry; this can be done by placing a 4’x4’ plastic sheet and taping down the edges. If after 24 hours, the substrate is still dry below the plastic sheet, then the substrate is dry enough to start coating. The plastic sheet testing is also a good method to determine if any hydrostatic pressure problems exist that may later cause disbonding.

PRIMING: No primer is necessary. This material is self-priming. However, any suitable primer can be used.  Can use the liquid only NP1 as a primer to aid in application.  In some applications, primers such as our NP162 can be used to aid in application.

PRODUCT MIXING:This product is packaged in pre-measured kits. Use the entire kit – do not modify. Pour the part A into a five gallon mixing vessel and add one bag of the powder pigment to the part A and mix about 15 seconds using a 1/2″ drill and jiffy type mixing paddle. With the mixer running, pour the part A into the mixing pail. Add the powder pigment bag to the part A liquid and mix for about 15 seconds. Add the part B liquids and mix again for another 15 seconds. Gradually, add all of the contents of the supplied filler part C into the liquid mixture and blend thoroughly until all particles are wetted out, normally about two minutes. Improper mixing may result in product failure. Make sure to apply the product immediately after it is completely mixed. For best mixing results and proper blending of parts A and B, recommend a Jiffy Mixer style drill mixer.

PRODUCT APPLICATION: (see application video) Apply the mixed material using a marginal trowel, cove base trowel or any other suitable application equipment at a minimum 1/8 inch thickness. Do not over trowel the material as this may cause isolated blisters to form. Maintain temperatures within the recommended ranges during the application and curing process.   Lay abutting edges within 10 minutes to ensure a clean edge. A “wet edge” installation is imperative during large applications to avoid lines and ridges in the finished cove base.

RECOAT OR TOPCOATING:  Topcoats are optional dependent on desired results. In some areas, a suitable novolac or other types of coatings can be used, depending on specific requirements.

SURFACE CLEANING: Caution! 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.

RESTRICTIONS: Restrict the use of the surface to light duty and non-harsh chemicals until the coating is fully cured (see technical data under full cure). It is best to let the surface 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.


  • Colors or clarity for clear may be affected by high humidity, low temperatures, or chemical exposure.
  • For best results use a high quality 1/4” nap roller.
  • Color or gloss may be affected by environmental conditions like humidity, temperatures, chemicals, or exposure to lighting such as sodium vapor lights.
  • Mortar Colors are different from colors used for other epoxies.  Colors may vary from batch to batch due variations in the silica filler.
  • For chemical exposure areas, we recommend a suitable topcoat to reduce porosity and chemical migration.
  • Substrate temperature must be 5°F above dew point.
  • All new concrete must be cured for at least 30 days.
  • Apply a suitable primer before using this product.
  • Physical properties are typical values and not specifications.

NOTICE TO BUYER: DISCLAIMER OF WARRANTIES AND LIMITATIONS ON OUR LIABILITY We warrant that our products are manufactured to strict quality assurance specifications and that the information supplied by us is accurate to the best of our knowledge. Such information supplied about our products is not a representation or a warranty. It is supplied on the condition that you shall make your own tests to determine the suitability of our product for your particular purpose. Any use or application other than recommended herein is the sole responsibility of the user. Listed physical properties are typical and should not be construed as specifications. NO WARRANTY IS MADE, EXPRESSED OR IMPLIED, REGARDING SUCH OTHER INFORMATION, THE DATA ON WHICH IT IS BASED, OR THE RESULTS YOU WILL OBTAIN FROM ITS USE. N0 WARRANTY IS MADE, EXPRESSED OR IMPLIED, THAT OUR PRODUCT SHALL BE MERCHANTABLE OR THAT OUR PRODUCT SHALL BE FIT FOR ANY PARTICULAR PURPOSE. NO WARRANTY IS MADE THAT THE USE OF SUCH INFORMATION OR OUR PRODUCT WILL NOT INFRINGE UPON ANY PATENT. We shall have no liability for incidental or consequential damages, direct or indirect. Our liability is limited to the net selling price of our product or the replacement of our product, at our option. Acceptance of delivery of our product means that you have accepted the terms of this warranty whether or not purchase orders or other documents state terms that vary from this warranty. No representative is authorized to make any representation or warranty or assume any other liability on our behalf with any sale of our products. Our products contain chemicals that may CAUSE SERIOUS PHYSICAL INJURY. BEFORE USING, READ THE MATERIAL SAFETY DATA SHEET AND FOLLOW ALL PRECAUTIONS TO PREVENT BODILY HARM.

Installing Vertical Cove Mortar