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

E15M Epoxy Mastic Steel Primer DTM & Concrete Coating | Low Temp 25°F

E15M is a two part, high solids, chemical resistant amine cured epoxy mastic.  E15M is specially modified with a proprietary blend of selective resins, wetting agents and rust inhibitors for concrete and steel.  Penetrates to provide exceptional adhesion and protection of steel surfaces, and to upgrade old, deteriorated coatings. Works great for both horizontal and vertical surfaces (up to 8 mils DFT).  Recommended as a high solids direct-to-metal (DTM) steel and metal primer under a wide variety of topcoats.

E15M is formulated for use over tightly adherent rusty steel and previously painted surfaces limited to hand or power tool cleaning.  Although blasting of steel is the best method of preparation, E15M provides exceptional adhesion and protection to non-blasted steel surfaces in any industrial facility.   Excellent chemical resistance for spill, splash and short term immersion.

E15M can be used as a high performance primer under epoxy, polyurethane, vinyl, acrylic topcoating to upgrade corrosion resistance in severe chemical exposures.  On concrete E15M provides excellent protection as topcoat over a primer.

Regular cure Low Temperature application down to 45°F (air and surface low temperature during curing process).  Fast Cure formula available for cold weather applying to surfaces down to 38° (needs to remain at this temp or above for at least 1 hour) and then during curing process temperatures further dropping ok to as low as 25°F.

Easy to apply with brush, roll and airless and conventional spray

Available in wide range of 13 colors COLOR CHART (not all available for E15M – see dropdown color selector above)in 1 gallon kit and 40 gallons (40 gallons ships in eight 5 gallon kits LTL Freight to commercial location only).  Available in a regular cure and fast set low temp cure to 25°F.

PRIMER: Recommend concrete primer when applying E15M over concrete.  E5015 Epoxy WB Primer or equivalent

TOPCOAT: Most epoxy, polyurethane, polyaspartic, vinyl, acrylic topcoats.  For severe chemical environments, topcoat with E517 Epoxy Mastic

Where is the E15M Epoxy used?

  • Structural steel tanks and vessels
  • Water towers and equipment
  • Pipe lines and racks
  • Metal buildings, fences, catwalks
  • Bridges, railings, fire escapes, etc., in chemical processing plants
  • Pulp and paper mills
  • Sewage and waste water treatment facilities
  • Fertilizer plants
  • Petroleum refineries
  • Electric generating stations
  • Coal handling operations
  • Marine installations
  • Manufacturing plants
  • Warehouses

Why the E15M Epoxy Used?

  • High solids DTM (direct-to-metal) chemical resistant steel primer or finish coat to steel and concrete
  • Self priming to steel including tight rust
  • Apply Vertical Surfaces to 8 mils DFT Steel & Concrete
  • Great primer for use with our E1500HN (horizontal) and E555VN (vertical) Novolac Chemical Resistant Epoxies
  • USDA Approved
  • Tight film, low permeability
  • Exceptional adhesion Exceeds 500 psi
  • Excellent impact resistance Direct 90 in lb
  • Excellent abrasion resistance CS 17 Wheel, 1000 cycles, 1000 g Load Result: 21 mg
  • Excellent against “undercutting” from rust and build to protect sharp edges
  • Easy to apply brush, roll and spray
  • Fast cure option for cold weather cure to 25F
  • Available in 13 colors



Solids By Volume 82% +/-
VOC 161 g/L
Finish Gloss – 85 ±  5%
Recommended Coverage & Dry Film Thickness 5.0 – 7.0 dry mils at 188-263 sq. ft. per gallon
Coverage per Gallon 188-263 sq. ft. per gallon
Packaging 1 gallon 5 gallon (5 gallon ships LTL Freight only)
Mixing ratio 4:1 by volume.  Mix 4 parts Base (Part A) to 1 part Hardener (Part B)
Shelf Life 12 months in unopened container
Flexibility:  Conical Bend Mandrel Method:  ASTM D522, 180º Bend Result:  Passes 1/8”
Humidity Resistance Passes 1,000 hrs ASTM D4585
Impact Resistance Direct 90 in lb ASTM D4585
Abrasion Resistance CS 17 Wheel, 1000 cycles, 1000 g Load Result:  ave 21 mg  ASTM D4060
Pencil Hardness Result H ASTM D3363
Sward Hardness Result 40 ASMT D2134
Salt Fog Resistance Passes 1,000 hrs ASTM B117
Adhesion:  Cross Cut Rating of 5 ASTM 3359
Adhesion:  Elcometer 106 Exceeds 500 psi D4541
Dry Heat Resistance 150ºF ASTM D2485
Dry Service Temp 170ºF
Clean-up SA-74 Thinner or substitute 100% MEK Solvent


Coverage Per Gallon 188-263 Sq. Ft. Per Gallon



Temperature Tack Free Min Recoat Time Max Recoat Time
90ºF 1-2 hours 5-6 hours 3 days
75ºF 3-4 hours 7-8 hours 7 days
50ºF 8-12 hours 36-48 hours 10 days


Regular Cure

Temperature Light Traffic Heavy Traffic
90ºF 18 Hours 48 Hours
75ºF 24 Hours 72 Hours
50ºF 36 Hours 96 Hours
35ºF Na Na

Low Temperature Fast Cure

Temperature Light Traffic Heavy Traffic
90ºF 12 Hours 36 Hours
75ºF 18 Hours 48 Hours
50ºF 24 Hours 72 Hours
35ºF 48 Hours 96 Hours


Times may be longer for thickness above 5 dry mils.  For safety and proper product curing, good ventilation is necessary when painting indoors or in confined areas.  Be sure the batch numbers are all the same to provide uniform color.  Epoxy coatings may yellow or darken during application and after final cure.  This will affect the color but will have no effect on the performance of the product.  Heaters that emit carbon dioxide and carbon monoxide can cause the coating to yellow.  For maximum interior gloss and color retention apply one (1) topcoat of PC-270 Polyester Epoxy.  For maximum exterior gloss and color retention apply a topcoat of CT-370 polyurethane.


45°-120°F with relative humidity below 90%.  When spraying, use a 50% overlapping crosshatch pattern to minimize the occurrence of pinholes.  Do not apply over dew or frost.  The surface should be dry and at least 5°F above the dew point.

Regular cure Low Temperature application down to 45°F (air and surface low temperature during curing process).  Fast Cure formula available for cold weather applying to surfaces down to 38° (needs to remain at this temp or above for at least 1 hour) and then during curing process temperatures further dropping ok to as low as 25°F.

CHEMICAL RESISTANCE, SPLASH & SPILLAGE (spill time for 72 hours contact with surface)

Aluminum Nitrate 50% Grape Fruit Juice Peanut Oil
Aluminum Sulfate 50% Hexylene Glycol Phosphoric Acid 20%
Apple Juice Hydraulic Fluid Power Steering fluid
Beer Hexane Rock Salt
Brine Honey Sodium Bisulfate 50%
Barium Chloride Iodine Sodium Bromide 40%
Boric Acid 25% Jet Fuel (JP4, JP5, JP7) Sodium Carbonate 30%
Calcium Chloride 50% Kerosene Sodium Hydroxide 50%
Castor Oil Ketchup Sulfuric Acid 20%
Copper Sulfate 50% Linseed Oil Transmission Fluid
Corn Oil Lactic Acid 25% Tomato Juice
Cutting Oil Milk Vegetable Oil
Diesel Fuel Mineral Oil Whiskey
Diethylen Glycol Mineral Spirits Wine
Distilled Water Molasses Xylene
Ethylene Gylcol Motor Oil
Fish Oil Mustard
Fuel Oil Naptha (aliphatic)
Gasoline (unleaded) Oleic Acid
Glycerin Olive Oil
Glyoxal Orange Juice


Remove all dirt, grease, oil, soil, chemical contaminants, and other matter before any mechanical preparation.  The surface must be free of any salt contamination.  Prepare and paint only clean surfaces in accordance with Steel Structures Painting Council (SSPC) or National Association of Corrosion Engineers (N.A.C.E.) specifications.


Sand Blast – Best  Sand Blast to a “Commercial” (SSPC-SP6) or “Near White” (SSPC-SP10) metal finish.
ower Tool Clean  Follow instructions as outlined in SSPC-SP3 specification.
Hand Cleaning  Follow instructions as outlined in SSPC-SP2 Specification.

Note:  Prime surface the same day.

Galvanized Steel/Aluminum:  Solvent clean per SSPC-SP1 or steam clean.  Sweep blast to achieve a minimum 1 mil profile.  Apply one (1) coat of E15M as a primer at 3-4 mils DFT.

Previously Painted Surfaces: Solvent clean per SSPC-SP1 and/or power wash.  Remove loose existing paint by wire brush or other hand tools.  Feather edges.  Make test application to check for compatibility.


In all cases of surface preparation, the pH should be checked.  A pH reading of 7.0 to 8.5 is acceptable. Also, a Water Dissipation Test should be made on random areas of the floor to determine if the proper degree of porosity has been achieved.  Before the installation of any Gulf Coat Paint Products, the substrate should be examined for moisture.  Test for moisture vapor transmission using ASTM F-1869 Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Subfloor using Anhydrous Calcium Chloride.  The maximum allowable rate is 3 lbs. per 1,000 square feet per 24 hours.  Test for relative humidity in concrete floor slabs using Probes according to ASTM F-2170.  This test measures the presence relative humidity of the slab below the surface.  The maximum relative humidity should be below 80%.

New concrete must be cured at least a minimum of 28 days before applying a coating.  On-grade slabs must have moisture vapor barrier in place.  All laitance, sealers, efflorescence, chemical contaminants, grease, oil and other foreign material must be removed.  The prepared surface must be clean, dry and structurally sound.  Recommend mechanical preparation by means of shot blasting or diamond grinding to achieve a CSP-2 or CSP-3 profile, in accordance with the International Concrete Repair Institute (ICRI).  The profile should reflect something similar to a 60-100 grit sandpaper.  If the substrate is not properly prepared and the appropriate profile is not achieved, failure of the product to adhere to the substrate may occur.

Old concrete surfaces must be structurally sound.  Any unsound areas must be repaired prior to proceeding with the resinous installation.  For proper patching and repairing, use CF-615 and/or PC-1000 with graded aggregate.  Remove existing paint and loose concrete by rough sanding, sandblasting, high pressure water cleaning, shot blasting or grinding.  In some cases where plant conditions allow, a stripper may be used to remove excessive build-up of paints or sealers.

Concrete Coating System
The properly sound, cleaned concrete must be primed first with either PC-149, PC-155, or PC-1703 Epoxy Concrete Primer per label instruction.  Two coats of E15M Epoxy at approximately 5-7 mils dry per coat is recommended for light traffic areas.  For heavy forklift and high abrasion areas, CT-352 Polyester Polyurethane Coating at 2-3 mils dry film thickness is recommended as the top coat over one coat of E15M Epoxy.

Stir each component to a uniform consistency, using a slow speed variable speed explosion proof drill with a Jiffy Mixer.   Do not mix by hand.   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.

Make sure any pigment settled to the bottom is incorporated.  Do not vary proportions.  E15M is prepared by mixing 4 parts base (Part A) to 1 part Hardener (Part B) with a power mixer.  E15M may be thinned using S-74 Solvent or 100% MEK Solvent up to 10% by volume for airless spray and up to 20% by volume for conventional spray.  When rolling, thin 10-20% by volume.


Airless Spray Graco Conventional Spray DeVilbiss
Gun Silver Plus Gun MBC or JGA
Pump 33:1 Extreme Fluid Tip D
Tip Range .019 to .023 Air Cap 64
Hose 3/8 inch ID Atomizing pressure 60 psi
Pressure 2400 to 2700 psi Hose 1/2 inch ID
Filter Size 60 mesh

Roller – Use a 3/8” – ½” nap, phenolic core, shed resistant roller cover.  Roll in the same direction always keeping a wet edge.  Do not over roll product.

Brush – Use pure bristle brush.

When spraying, use a 50% overlapping crosshatch pattern to minimize the occurrence of pinholes.  Do not apply to surfaces below 45°F or above 120°F.  Do not apply over dew or frost.  The surface should be dry and at least 5°F above the dew point.


  • Do not apply over frost, wet or damp surfaces or extremely high humidity conditions.
  • Do not apply over expansion joints.
  • Do not apply if the surface temperature is within 5° of the dew point.
  • Partially used containers must be reclosed tightly to prevent moisture in air from reacting with material and forming a tough skin.  Skin can be removed and remaining material used.  Be sure to stir.


E15M is flammable.  Keep away from all sources of ignition during mixing, application and cure.  CM-15 Hardener is corrosive.  The Hardener and Base can cause eye and skin burns as well as allergic reactions.  Use goggles, fresh air masks or NIOSH approved respirators, protective skin cream and protective clothing.  This product is sold without warranty as to performance expressed or implied.  Users are urged to make their own tests to determine the suitability for their particular conditions.

SEE MATERIAL SAFETY DATA SHEET FOR FULL SAFETY PRECAUTIONS.  FOR PROFESSIONAL AND INDUSTRIAL USE ONLY  KEEP AWAY FROM CHILDREN.  NOT FOR RESIDENTIAL USE 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 SAFETY DATA SHEET AND FOLLOW THE PRECAUTIONS TO PREVENT BODILY HARM.