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ARCOR EE-121 Prime
Updated May 2020

EE121 Blue


DESCRIPTION AND RECOMMENDED USES: ARCOR® EE-121 Prime is a solvent free, high 3.6 functionality epoxy Novolac coating suitable for immersion and non-immersion service. Designed specifically for as an aggressive chemical and high temperature resistant coating. Produces a tough, chemical resistant coating on ferrous    and non-ferrous metals for full immersion and concrete for secondary containment. To be used as a prime coat as needed with ARCOR® EE-121 or EE-121 HT.



TEMPERATURE: Immersion service

Max.350ºF (177ºC); Spike to 450ºF (3 Hrs) Recommended force cure at 250º[email protected] 2 hrs. Dry to 500ºF; Spike to 580ºF (3 Hrs)

ABRASION:  Very Good


FILM THICKNESS: 20 mils(.51 mm)/coat

APPLICATIONS: Methanol Pumps, Tanks, Pipes, FGD Duct. Exterior: 2 coats, Immersion: 2-3 Coats. Aggressive Chemical Tank Linings and Secondary Containment Areas, Industrial Floorings. Recommended Force Cure at 250º[email protected] 2 hrs for most aggressive applications.


VISCOSITY: 60,000-85,000 cps

POT LIFE: 15 MIN/100gr @ 72ºF

MIX RATIO: 2:1 by Volume (Base:Activator) 100 gm: 60 gm by weight


SHELF LIFE: 5 Years at 55-95ºF  (13-35ºC)

COVERAGE: 80 ft²(7.5 M²)/gal/coat

WEIGHT PER GALLON: 10.8 lbs (4.9  KG)


REVISED 10/2014


SURFACE PREPARATION: Steel surfaces are to be abrasive blasted with chloride free abrasive. Exterior applications to SSPC SP-10 Near White metal finish. Immersion applications to SSPC SP-5 White metal 3 to 5 mil profile. Grind flat all burrs, weld seams, radius sharp edges. Fresh blasted ferrous surfaces to be primed immediately to prevent oxidation of surface.

Concrete surfaces should be degreased if oil and grease contamination is present. Degreased surface shall be  high pressure washed, acid etched and high pressure washed again so surface is clean and free of all grease, oils and surface laitance. Existing coatings should be abrasive blasted to clean concrete.

MIXING: Thoroughly mix Activator into Base with mixing stick or drill with low speed mixing blade scraping sides and bottom of container or mixing board. Mix by Volume 3 parts Base to 1 part Activator or by weight 100 grams base to 60 grams activator. Mix thoroughly to produce an even colored and streak-free material.

THINNING: Never thin.

APPLICATION: All spray equipment should employ traps to prevent water and oil from contaminating coating and screens to prevent particulate contamination.

Brush: medium to stiff bristle of sufficient quality that bristles do not pull out and stick in coating. Trim or tape  to <1” nap.

Roller: good quality 1/8” nap.

Plural Spray: .031-.039 tip, 2,500-3,500 PSI, Heat to 180ºF Base, 140ºF Activator. Airless Spray: Not Recommended

Conventional Spray: Not Recommended

APPLICATION TEMPERATURE: Material: Keep between 55 to 95ºF (17 to 35ºC). Substrate: Keep between 45 to 105ºF (7 to 40ºC). The difference   in temperature of the substrate and the material should never exceed 10ºF (5ºC). Substrate shall be a minimum of 5ºF (3ºC) above dew point. Do not apply if relative humidity exceeds 90%. If necessary heat metal prior to surface preparation using electric heater or heat lamp. Never use gas, oil or kerosene heaters as they will leave a greasy residue on metal surface. For best results keep all material in warm area overnight (75ºF+, 24ºC) for ease of mixing. If necessary base component of material can be heated by microwave for 30-45 seconds for a 1 KG Base unit or by warm water bath. Heat activator by warm water bath only. If necessary let material cool before application.

OVERCOAT / CURE TIME: By brush, roller or squeegee re-coat while material is still soft, but tack-free, between 1-8 hours at 77ºF (25ºC). If overcoat window is exceeded abrade surface with course sandpaper, grinder or brush blast and wipe with MEK or Acetone. By spray application re-coat between 1-4 hours at 77ºF. Full cure before immersion 72 hours at 77ºF. Add 1 1/2 hours additional cure time for each 10ºF below 77ºF. Force Cure with heat for best performance for 1 1/2 hours at 250ºF (121ºC).

CLEAN UP: Clean tools immediately after use with M.E.K., Acetone or similar. ARCLEAN or Isopropyl Alcohol can be used in solvent restricted areas

WARNING: Base contains epoxy resin. Activator contains alkaline amines, a strong sensitizer. May cause skin irritation, sensitization or other allergic responses. Use with good ventilation, particularly if heated or sprayed. Prevent all contact with skin or eyes. Wear protective clothing, goggles, gloves or barrier creams. Keep containers closed when not in use. Wash thoroughly after handling. In case of skin contact immediately wash with soap and water. In case of eye contact, flush with water for 15 minutes. If irritation persists seek medical attention.

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Manufacturer makes no warranty either expressed or implied including warranties of merchantability or fitness for a particular purpose for this product. Under no circumstances will the manufacturer be liable for incidental, consequential or other damages, breach of warranty, strict liability, or any other theory arising out of use of this product.