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  • Overview
  • Specs
  • Coverage Rate
  • Cure
  • Chemical
  • Application

E139FL Flexible Epoxy Primer & Floor Coating

E139FL is a two component 100% solids flexible epoxy designed for sealing traffic surfaces exposed to vehicular or foot traffic where a flexible epoxy coating or membrane is desired.  The toughness and excellent flexibility (elongation) eliminate the need to repair hairline cracks. This product is formulated for use in a flake and quartz granule broadcast systems as the basecoat prior to installing suitable polyaspartic, urethane and epoxy mortar topcoats.

As a high build flexible coating it can be used both indoors and outdoors where it helps protect against thermal cycling.  It can be applied up to 50 mils thick (32 sq’/gallon) and works well when used as a primer with broadcasting as a crack bridging sealer before application of appropriate topcoats.  It can also be used as a flexible membrane on wood floors when an epoxy penetrating primer is first applied.  For use as a flexible membrane apply at minimum 16 mils thick (100 sq’/gallon)

The E139FL should be topcoated with a UV resistant non-yellowing colored polyaspartic or urethane topcoat as the E139FL will yellow when exposed to sunlight especially when used outdoors.

The E139FL is a 1:1 mix ratio epoxy and is available in 1 quart, 1 gallon, 2 gallon and 10 gallon kits.  Available in a wide selection of 15 color options.  The clear color is not pigmented but is also not water clear but is a gardner 3-4 which means it is has an amber tone.

PRIMER: None required.  For use on wood surfaces as a flexible membrane, recommend an initial application of the E5015 Water Based Epoxy Primer or other suitable primers for proper bonding.

TOPCOAT:  For a non-yellowing UV resistant topcoat suggest our 322HW Semi-Gloss Urethane for solid color systems or when applying a clear topcoat to a flake floor system use E344QC Quick Cure High Gloss Polyaspartic .  For additional flexibility suggest our 5500-Ex Clear Polyaspartic.  Many urethane and polyaspartic coatings are acceptable

E139FL Flexible Epoxy Used?

  • Garages
  • Auto Service Centers
  • Warehouses
  • Laboratories
  • Aircraft Hangers
  • Cafeterias
  • Floors requiring a flexible epoxy

Why 139FL Flexible Epoxy?

  • Exceptionally flexible epoxy with 60% elongation
  • High Build up to 50 mils thick per coat
  • 100% Solids Commercial Epoxy
  • Excellent Adhesion 450 psi
  • Tough Abrasion resistant Only 6 mg loss (Tabor test) and 160 inch lbs Gardner variable impact test
  • For use with broadcast systems and as flexible membrane primer
  • Wide Variety of 15 Colors


Solids By Weight 100%   By Volume 100%
VOC 0g/L
Colors  Off white, white, light gray, medium gray, tile red, beige, dark gray, brown, blue, light blue, safety traffic yellow, camel tan, clear (gardner 3-4)
Recommended Film Thickness Apply at 10 – 50 mils
Coverage per Gallon 32 – 160 sq’/gal @10 – 50 mils thickness
Packaging  2 gallon kit, 10 gallon kit
Mix Ratio 1:1 mix ratio by volume
Shelf Life 1 year in unopened container
Abrasion Resistance Tabor abraser CS-17 wheel with 1000 gram total load and 500 cycles = 6 mg loss
Impact Resistance Gardner impact, direct = 160 in. lb (direct-passed)
Adhesion 450 psi @ecometer (concrete failure, no delamination)
Flexural Strength 2,600 psi @ASTM D790
Compressive Strength  4,100 psi @ASTM D695
Tensile Strength 2,450 psi @ASTM D638
Ultimate Elongation  60%
Viscosity Mixed = 1000 – 1700 cps (typical)
Hardness D = 58


Coverage Per Gallon 32 – 160 Sq’/Gal @10 – 50 Mils Thickness



Pot Life – 2 gallon volume 15-25 min
Tack Free (dry to touch) @70F 5-8 hours
Recoat or Topcoat 8-12 hours
Light foot traffic 12-14 hours
Full cure (heavy traffic) 2-7 days

APPLICATION TEMPERATURE: 60-90 degrees F with relative humidity below 85%


 acetic acid 5% A
 xylene A
10% HCI C
 skydrol A
 methanol A
 10% sodium hydroxide D
 50% sodium hydroxide D
 10% sulfuric acid C

Rating key: A – not recommended, B – 2 hour term splash spill, C – 8 hour term splash spill, D – 72 hour immersion, E – long term immersion.


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.


The most suitable surface preparation would be a fine brush blast (shot blast) to remove all laitance and provide a suitable profile.  All dirt, foreign contaminants, oil, and laitance must be removed to assure a trouble free bond to the substrate.  A test should be made to determine that the concrete is dry; 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 is dry enough to start coating.

PRIMING: Primers may be beneficial in some applications, dependent on performance characteristics and substrate condition, but none are required for product application.


This product has a mix ratio of 9.2# part A to 8.2# part B or one part A to one part B by volume.  Standard packages are in pre-measured kits and should be mixed as supplied in the kit.  We highly recommend that the kits not be broken down unless suitable weighing equipment is available.

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.  Improper mixing may result in product failure. For best mixing results and proper blending of parts A and B, recommend a Jiffy Mixer style drill mixer.

The epoxy should have a nice even consistency without any color streaks. Pour the E139FL out on the floor immediately after mixing and do not let the E139FL sit in the bucket.  Leaving it in the bucket for as little as a minute or two can shorten the pot life by half or more.

PRODUCT APPLICATION: The mixed material can be applied by brush or roller.  However, the material can also be applied by a suitable serrated squeegee and then back rolled as long as the appropriate thickness recommendations are maintained.  Because this material has a short pot life, it is beneficial in some applications to remove the material from the mixing pail by pouring the material onto the substrate and spreading it along the floor.  Spreading out the material will allow the applicator more time to work with the material before it begins to cure.  Aggregate should be broadcast into the applied material before applying suitable topcoats.

Maintain temperatures and relative humidity within the recommended ranges during the application and curing process.  If concrete conditions or over aggressive mixing causes air entrapment, then an air release roller tool should be used prior to the coating tacking off to remove the air entrapped in the coating. When using as a broadcast binder, always evaluate performance parameters with a test area which is dependent on aggregate size and thickness, prior to applicationve the air entrapped in the coating. Always maintain a wet edge to avoid color shading differences.

RECOAT OR TOPCOATING:   We recommend a suitable topcoat be applied only after broadcasting suitable aggregate into the basecoat.  If you recoat or topcoat this product, you must first be sure that the coating has tacked off before recoating.  All previous coats that were not applied as a broadcast, should be deglossed to insure a trouble free bond prior to application of recoats or topcoats.

It is advisable to test topcoats for suitability prior to application when not in a broadcast system.  Colder temperatures will require more cure time for the product before recoating or topcoating can commence.

Before recoating or topcoating, check for epoxy blushes (a whitish, greasy film, or deglossing.)  If a blush is present, it can be removed by any standard detergent, cleaner prior to topcoating or recoating.  Many epoxy coatings and urethanes as well as multiple coats of this product are compatible for use.

CLEANUP: Use xylol

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.


  • It is recommended that a broadcast application be performed with a subsequent topcoat system.  This product is not intended as a decorative coating, but merely as a flexible primer for bridging cracks in a broadcast system before topcoating.
  • 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.
  • Color or gloss may be affected by environmental conditions like humidity, temperatures, chemicals, or exposure to lighting such as sodium vapor lights.
  • Colors may vary from batch to batch. Therefore, use only product from the same batch for an entire job.
  • This product is not UV color stable and may discolor when exposed to UV lighting.  Otherwise the color stability of this product is good.  Therefore a topcoat is option and dependent on the environment.
  • Substrate temperature must be 5°F above dew point.
  • All new concrete must be cured for at least 30 days.
  • 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.