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

E370P Hi-Gloss Hi Build Polyurethane | Non-Yellowing | Vertical Concrete & Steel

A two component, acrylic aliphatic isocyanate polyurethane coating with excellent gloss and color retention.  E370P cures to a very tough, abrasive resistant film with exceptional exterior durability, chalk resistance, color stability, and long term gloss retention. E370P has a tile-like finish which is very tough but yet a flexible film with good chemical and stain resistance.

Ideal for use as a long lasting wall or vertical surface topcoat in both interior and exterior Industrial, Commercial and Marine applications.  Not for use directly on unprimed surfaces.  Not designed for floor applications or submerged service.   Can be applied over existing epoxy, polyaspartic or urethane coatings (do not apply over acrylic paint) after proper preparation including sanding and wiping with acetone solvent right before application (apply E370P as soon as acetone solvent is dry).

Available in 1 gallon kit and 5 gallon kit (special order only) with mix ratio 4:1 by volume (4 parts Base Part A to 1 part Hardener Part B).  Comes in clear and 21 colors including full range of safety colors.

Long 4-6 hour POT life @ 75ºF.  Apply at 2.0-5.0 dry mils per coat, 200-496 sq. ft. per gallon

Application using a Conventional, airless spray, brush or roller.

Due to California State Environmental Regulations, E370P is NOT FOR SALE IN CALIFORNIA – PLEASE ORDER OUR VOC COMPLIANT VERSION – E375P instead

PRIMER: Recommend the 5015V Water Based Epoxy Primer and for heavier duty or steel applications the E15M Epoxy Mastic Primer.Can be applied to existing epoxy, polyaspartic or urethane coatings after proper preparation including sanding using 100 grit and wiping with acetone solvent right before application (apply E370P as soon as acetone solvent is dry).

TOPCOAT:  Can apply multiple coats of the E370P

Where is the E370P used?

  • storage tanks
  • vessels
  • water towers
  • oil rigs
  • structural steel
  • bridges
  • equipment
  • handrails
  • pipe lines and racks
  • pumps
  • machinery
  • exterior of buildings
  • chemical processing plants
  • pulp and paper mills
  • sewage and waste water treatment facilities
  • fertilizer plants
  • petroleum refineries
  • power plants
  • amusement parks
  • coal handling operations
  • food processing plants
  • marine installations

Why E370P Coating?

  • Great Interior & Exterior Vertical Concrete & Steel Protection
  • Exceptional Exterior Durability
  • High solids
  • Tile-like finish.
  • Easy to clean
  • Good chemical and stain resistance
  • Highly resistant to abrasion and impact.
  • Excellent gloss and color retention to UV exposure
  • Passes 2500 hrs – QUV Accelerated Weathering Test ASTM D4587
  • Outstanding wearing properties.
  • Non-chalking and non-yellowing
  • High film build
  • Handles up to 300°F Dry Service
  • Long 4-6 hour POT life @ 75ºF
  • Available in clear and 21 colors

Polyurethane Color Chart


Solids By Volume 62% +/- 2% (white)
VOC 323g/L
Colors Clear, White, Light Gray, Medium Gray, Dark Gray
Recommended Film Thickness 2.0-5.0 dry mils per coat, 200-496 sq’/gallon
Shelf Life 12 months minimum in unopened container
Packaging 1 gallon kit, 5 gallon kits (5 gallon kits ship LTL Freight only)
Mixing ratio 4:1 by volume.  Mix 4 parts Base (Part A) to 1 part Hardener (Part B)
Dry Service Temperature 300°F
Gloss Level High Gloss
QUV ASTM E4587 Passes 2500 hrs – retained 91 units gloss (UV light exposure)
Heat Resistance 300ºF  ASTM D2485
Abrasion Resistant CS-17 Wheel, 1000 cycles 66 mg ASTM D4060
Heat Resistance 300ºF  ASTM D2485
Salt Fog Passes 1,000 hours  ASTM B117
Humidity Resistance Passes 1,000 hours ASTM D4585
Adhesion Cross Cut Rating of 5   ASTM 3359
Impact Resistance Passes 100 inch lbs direct   ASTM D2794
Heat Resistance 300F   ASTM D2485
Flexibility Passes 180º Bend 1/8″ mandrel
Pencil Hardness Gauge Method H  ASTM D3363
Sward Hardness Result 64  ASTM D2134


Coverage Rate 200-496 Sq’/Gallon


Temperature Tack Free Min Recoat Max Recoat
90ºF 1 hours 6 hours 1 days
75ºF 2 hours 8 hours 2 days
50ºF 4-6 hours 24 hours 4 days

Times may be longer for thickness above 2.5 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.  Heaters that emit carbon dioxide and carbon monoxide can cause the coating to yellow.

APPLICATION TEMPERATURE: 50ºF – 120ºF Do not apply to surfaces below 50°F or above 120°F. Do not apply over dew or frost. The surface temperature should be at least 5°F above the dew point.


(spill time for 72 hours contact with surface)   Not recommended for Immersion Conditions.

Acetic Acid 5% Gasoline, unleaded Oxalic Acid
Alcohol 10% Glycerine Peanut Oil
Aluminum Chloride 29% Hexane Pepper
Ammonium Chloride 25% Hexylene Glycol Phosphoric Acid 20%
Ammonium Hydroxide 10% Hydraulic Fluid Potassium Chloride
Boric Acid 23% Hydrochloric Acid 10% Power Steering Fluid
Castor Oil Jet Fuel (JP-4, JP-5) Prune Juice
Calcium Hydroxide Kerosene Rum
Citric Acid Ketchup Sea Water
Corn oil Lard Sodium Hydroxide 10%
Copper Sulfate 10% Lactic Acid Soybean Oil
Crude Oil Lime Tali Oil
Cutting Oil Milk Tannic Acid Solution
Detergent Mineral Oil Titanium Dioxide
Distilled Water Mineral Spirits Toulene
Diesel Fuel Molossas Transmission Fluid
Diethylene Glycol Motor Oil (SAE 30) Vegatable Oil
Ethylene Glycol Mustard Vodka
Ethylene Oxide Naptha (aliphatic) Whisky
Fish Oil Nitric Acid 5% Xylene
Fuel Oil Oleic Acid


SURFACE PREPARATION  E370P Polyurethane Enamel is a top coat only and is not recommended to be used directly over unprimed surfaces. Apply over appropriate primers or intermediate coats. Surfaces must be free from all oil, grease, dirt, water, or other foreign matter.  E370P Polyurethane is not recommended for immersion service.

Steel: All surface contamination, such as dirt, dust, grease, oil and other deposits must be removed prior to abrasive blast cleaning. Solvent cleaning as outlined in Steel Structures Painting Council’s Specification SSPC-SPI should be used to remove all foreign matter. If previous service has left surface deposits of chemicals, they also must be removed by pressure washing and followed by a thorough water rinsing.

Remove all rust, mill scale, loose paint and any previous existing coatings by dry abrasive blasting all steel surfaces before applying the coating system.

Recommended primers for the E370P are E15M Chemical Mastic, PC-2.8 Epoxy Coating, PC-517 Epoxy Mastic,  E100 Aluminum Polyurethane and PC-110 Epoxy Primer. Follow the recommended recoat time per label in structions. In some cases an intermediate coat may need to be applied when a 3 coat system is necessary or desired.

Galvanized Steel/Aluminum and Non-Ferous Metals: Degrease and chemically clean surfaces in accordance with SSPC-SP1 Solvent Cleaning Specification. The surface should be sweep blasted and primed with E15M, E100 Aluminum Polyurethane or PC-110 primer. Recoat time is minimum 5-6 hours for PC-110, 8 hours for E15M and E100 is 2-6 hours at 75 before applying E370P High Build Polyurethane.

Zinc Rich Primer Sand blast to a SSPC-SP10 “near white” blast or SSPC-SP6 “commercial” blast. Apply MCU-104 at 2.5 to 3.5 mil DFT. Allow a minimum of 4-5 hours recoat time @ 75°F and 50% R.H before applying CT-370 High Build Polyurethane. For best results, apply an intermediate coat of PC-110, CM-15 or PC-2.8 Epoxy

Marginally Prepared Steel Surfaces:

Degrease and chemically clean surfaces in accordance to SSPC-SP1 Solvent Cleaning spec to remove all oils, grease, and other soluble contaminants.  If steel is chemically contaminated (e.g., acid, caustic, or salts), high pressure water cleaning at a minimum of 5,000 psi is recommended to remove chemicals.  The pH of steel should be tested to ensure that surface of steel is between 7.0-8.5 pH.  After the above process has been completed, power tool cleaning is to be done.  Power tool clean to remove all mill scale, loose rust, loose paint and other detrimental foreign matter.  Apply two coats of our E100 Aluminum Polyurethane at 2-3 mils DFT.  Minimum recoat time for E100 is two (2) hours, maximum recoat time is six (6) hours at 75°F and 50% relative humidity.  E15M Chemical Mastic or PC-636 Low Temp.  Epoxy may also be used as a primer under the CT-370 High Build Polyurethane on marginally prepared surfaces.

Concrete/Masonry Surfaces:

New concrete must be cured at least a minimum of twenty-eight (28) days before applying a coating.  All laitance, efflorescence, chemical contaminants, grease, oil, and other foreign material must be removed.  The  prepared surface must be clean, dry, and structurally sound.  Accepted methods of surface preparation are  dry abrasive blast, wet abrasive blast, vacuum shot blast, high pressure water blast, scarifying, scabbling and acid etch/water rinse.

Voids, cavities, spalled areas, and other structural defects should be trowel-grouted smooth with CF- 615  Epoxy Crack Filler or PC-1000 Epoxy Mortar.  Rub smooth with a hand grinding stone any burrs or high protruding aggregate left uneven by troweling.

Consult Gulf Coast Paint regarding the testing of the concrete for proper pH, vapor barrier testing and surface porosity.

Acceptable primers for the CT-370 Polyurethane are PC-149, PC-155, and PC-1703 Epoxy Concrete Primers. An Epoxy Intermediate coat may be needed if higher film build is necessary.   Products such as CM-15, PC-636, PC-275, PC-517 or 100% solids materials such as PC-1803 or PC-1850 can be used.   CT-370 is not designed for forklift and other heavy trafficked areas.  Use CT-332 Clear or CT-352 Pigmented Polyester Polyurethane for maximum floor protection.

Block Walls

Block walls should be free of salts, soap film, oil, grease, dirt, dust and other contaminants and foreign material that will interfere with adhesion of coating system.  The block must be dry and free of moisture.  Apply Gulf Coat Paint’s PC-145 Block Filler at a rate of 75-100 square feet per gallon. Use a 3/4” – 1-1/4″  roller cover.  Apply PC-145 Epoxy in multiple directions for uniform filling of block.  Block walls should be evenly and uniformly filled.  Allow PC-145 Block Filler to cure for 24-72 hours before applying an Epoxy Intermediate Coat, e.g., PC-110, CM-15, or PC-517.


Stir each component to a uniform consistency, using a slow speed explosion proof variable speed drill with a Jiffy mixer.  Make sure any pigment settled to the bottom is incorporated.  Do not vary proportions.  E370P is prepared by mixing 4 parts Base (Part A) to 1 part Hardener (Part B) with the power mixer.  E370P may be thinned up to 20% with SU-94 for spray applications (can substitute thinning up to 5% – 10% with a 100% Xylene).

For best mixing results and proper blending of parts A and B, recommend a Jiffy Mixer style drill mixer.

NOTE:  Always wear protective gloves and clothing while mixing and applying E370P.  Do not get on skin.


Best method of application is conventional or airless spray use up to 10% Thinner.  Flush equipment thoroughly with MEK solvent before using and use a moisture trap on the air supply.

FOR SPRAY APPLICATION (Airless or Conventional)

Airless Spray Graco Conventional Spray DeVilbiss
Gun Silver Plus Gun MBC or JGA
Pump 33:1 Extreme Fluid tip E or F
Tip Range .013″ – .017″ Air cap 704 or 777
Hose 3/8″ ID Atomizing Pressure 50-60 psi
Pressure 2000-2500 psi Fluid Pressure Hose 3/8″ ID
  • When spraying, use a 50% overlapping crosshatch pattern to minimize the occurrence of pinholes.  Do not apply to surfaces below 50°F or above 120°F.   Do not apply over dew or frost.  The surface temperature should be at least 5°F above the dew point.  RollerThin up to 10% by volume with SU-93 Reducer, depending on temperature.  Use a ¼” – 3/8” short 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.


E370P is flammable. Keep away from all sources of ignition during mixing, application and cure. Contains Aliphatic Polyisocyanates, N-Butyl Acetate, Xylene, MEK, Ester Solvent and PM Acetate. The mixtures of BASE (Part A) with HARDENER (Part B) can cause eye and skin burns as well as allergic reactions. The use of goggles, fresh air masks or NIOSH approved respirators, protective skin cream and protective clothing is a recommended standard practice when spraying. 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.


  • Do not apply over frost 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.
  • Always apply a test patch of E591 for owners approval prior to application
  • 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.

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.