SURFACE PREPARATION
E398 Polyurethane Enamel is a top coat and is not recommended 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. E398 is not recommended for immersion service.
- Carbon 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, the 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 E398 are E15 Chemical Mastic and E100 Aluminum Follow the recommended recoat time per label instructions. In some cases an intermediate coat may need to be applied when a 3 coat system is necessary.
2. Aluminum, Galvanized Steel and Non-Ferrous Metals
Degrease and chemically clean surfaces in accordance with SSPC-SP1 Solvent Cleaning Specification. The surface should be sweep blasted and primed with E15 and E100 Aluminum. Recoat time is 8 hours for E15 and E100 is 2-6 hours at 75° before applying E398 High Build Polyurethane.
3. Zinc Rich Primer
Sand blast to a SSPC-SP10 “near white” blast or SSPC-SP6 “commercial” blast. Apply E104 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 E398High Build Polyurethane. For best results, apply an intermediate coat of E15 or E2.8 Epoxy.
4. Marginally Prepared Steel Surface
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 insure 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 E100 Aluminum at 2-3 mils DFT. Minimum recoat time for E100 is two (2) hours, maximum recoat time is twenty-four (24) hours at 75°F and 50% relative humidity. E15 Chemical Mastic may also be used as a primer under the E398 High Build Polyurethane on marginally prepared surfaces.
5. 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 Blastrac, high pressure water blast, scarifying, scabbling and acid etch/rinse.
Voids, cavities, spalled areas, and other structural defects should be trowel-grouted smooth with E615 Epoxy Crack Filler or E1000 Epoxy Mortar. Rub smooth with a hand grinding stone any burrs or high protruding aggregate left uneven by troweling.
6. 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 E145 Block Filler at a rate of 75-100 square feet per gallon. Use a ¾ – 1¼” roller nap butterfly roll in different directions. Block walls should be evenly and uniformly filled. Allow Block Filler to cure for 24-72 hours before applying an Epoxy Intermediate Coat, e.g. E15 Chemical Mastic
MIXING INSTRUCTIONS
Stir each component to a uniform consistency, using an explosion proof variable speed drill with a Jiffy mixer. Make sure any pigment settled to the bottom is incorporated. Do not vary proportions. E398 is prepared by mixing 4 parts Base (Part A) to 1 part Hardener (Part B) with the power mixer. E398 may be thinned up to 15% with SU-94 for spraying and 10% with SU-93 for rolling.
V.O.C.
Unthinned Thinned 5% Thinned 10% Thinned 15%
2.83 lbs/gl 3.07lbs/gl 3.26 lbs/gl 3.44 lbs/gl
(340 gms/liter) (368 gms/liter) (391 gms/liter) (412 gms/liter)
APPLICATION PROCEDURE
Best method of application is conventional or airless spray use up to 15% SU-94 Spray Thinner. Flush equipment thoroughly with MEK solvent before using and use a moisture trap on the air supply.
Airless Spray Graco Conventional Spray DeVilbiss
Gun Silver Plus Gun MBC or JGA
Pump Xtreme 33:1 Fluid Tip E or F
Tip Range .013 – .017 Air Cap 704 or 777
Hose 3/8 inch I.D Atomizing Pressure 50-60 psi
Pressure 2000-2500 psi Fluid Pressure 15-25 psi
Filter Size 60 Mesh Hose 3/8 inch 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.
Roller – Thin 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.
CAUTIONS
E398 is flammable. Keep away from all sources of ignition during mixing, application and cure. Contains Aliphatic Polyisocyanates, N-Butyl Acetate, Xylene and PM Acetate. The HARDENER (Part B) and 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.
SEE SAFETY DATA SHEET FOR FULL SAFETY PRECAUTIONS.
FOR PROFESSIONAL AND INDUSTRIAL USE ONLY
KEEP AWAY FROM CHILDREN. NOT FOR RESIDENTIAL USE
