The AF 820 System is a flakeglass filled bisphenol polyester resin that is applied to a total thickness of approximately 20 mils. The lining consists of approximately 100 individual layers of overlapping inert glass flakes. Each layer of flakes is bonded with an extremely chemical resistant resin which provides an excellent vapor and chemical barrier that reduces permeation to the lined substrate. Armor Flake 820 bonds to steel, wood, and concrete. Used to line surfaces that are exposed to strong chemical splash and fumes, Armor Flake 820 demonstrates very good chemical resistance, toughness, and resistance to abrasion. A few uses for Armor Flake 820 lining are:

  • AF 822-1 Primer – bisphenol polyester resin
  • AF 822-2 Trowel Grade Lining – flakeglass bisphenol
  • AF 822-3 Sealing Coat – bisphenol polyester with wax added

Chemical Resistance

Armor Flake 822 is resistance to acids. Contact the Wil-Cor, Inc. Technical Department for chemical resistance in specific service conditions.


  • High resistance to acids
  • Easy application
  • Bonds to steel, wood or concrete

Physical properties

Color Off White (others by request)
Water Vapor Transmission 0.0008 Perm Inch
Solids Content 100%
Maximum Service Temperature
Continuous exposure 175 °F
Intermittent exposure 350 °F
Flash Point 80 – 100 ° F
Cure Time @ 75 °F 12 hrs
Bond to Steel 2,000 psi
Abrasion Resistance, Tabor CS-17 wheel 72-76
Barcol Hardness 36-40
Coefficient of Expansion, in./in./°F 12-16 x 10
Thermal Conductivity, BTU/sq. ft./hr/°F/in 1.30

Installation Recommendation

Wil-Cor, Inc. recommends supervision by Wil-Cor or that this product be installed by experienced fiberglass installers. Preparation, mixing and application information is provided for installers with adequate installation experience.


All components of the Armor Flake 822 Lining System are catalyzed with Armor Plate 60, methyl ethyl ketone peroxide. The mixing ratio is 1.0-2.0 oz. of catalyst for each gallon of AF 822-1, AF 822-2, or AF 822-3. Use 1.0 – 1.5 oz. of catalyst per gallon at temperatures above 85° F. NEVER use more than 2.0 oz. of catalyst per gallon of Armor Flake 822 component.

Catalyzed Armor Flake 822 components have a short pot life (5 to 15 min.). Mix only enough material to use during a short period.

Begin the mixing process with 1 quart of AF 822-1, AF 822-2, or AF 822-3, and the proper proportion of catalyst. Measure the quantities of catalyst and component carefully, because only a small amount of catalyst is necessary for each quart of component.

After the catalyst and component are thoroughly mixed, remove the material from the mixing pot and quickly spread over the surface. Catalyzed material will not set up as quickly if it is not concentrated in the pot. Immediately follow the initial spreading process with a thorough application procedure.

If the applied material does not set up within 3 to 4 hours, the amount of catalyst in the mixture may be increased. DO NOT add more than 2.0 oz. of catalyst per gallon of component.

Surface Preparation

For Concrete:

  • 1All surfaces must be clean. Remove all dirt, oil, grease and contamination by sandblasting or acid wash.
  • 2All surfaces must be sound. Remove laitance, powdered concrete, or weak concrete by sandblasting, using a no. 3 sand.
  • 3Acid wash with a diluted muriatic acid wash made of acid and water at 2:1 or 1:1.
  • 4The acid wash should remain on the surface until the acid stops bubbling, then the surface should be rinsed with water.
  • 5If the surface needs to be roughened to produce a good bonding face, repeat acid wash and then water rinse.
  • 6The concrete must be completely dry before the Armor Flake 822-1 primer is applied.
  • 7AF 822 is not suitable for large concrete areas.

For Steel:

  • 1All surfaces must be clean. Remove all oils, greases, paints or chemicals and sandblast to white metal.
  • 2Steel may be mechanically cleaned if sandblasting is not possible.
  • 3To prevent rusting, prime the surface with Armor Flake 822-1 Primer immediately after cleaning. The primer is not necessary if the Armor Flake 822-2 lining is to be applied within 8 hours of sandblasting.

For concrete, carbon steel, or wood:

The surface to which Armor Flake 822 is applied should be smooth, without cracks, pits or sharp burrs. Rough areas may be smoothed or filled with Armor Plate 805, a catalyzed putty material, or they may be topped with a laminate consisting of a 1.5 oz. mat or cloth tape saturated with AF 822-1 Primer. All baffles, nozzles and flanges should have a laminate applied before the AF 822-1 Primer is applied.


Armor Flake 822-2 Lining:

  • 1AF 822-2 may be applied after the AF 822-1 Primer and any patched areas are hard to the touch.
  • 2Armor Flake 822-2 is applied by trowel.
  • 3The minimum applied lining thickness is 30 to 40 mils. The recommended thickness is 40 mil on the shell of tanks and 60 mil on the bottom of tanks. Two coats of lining may be applied if necessary.
  • 4Thin with AF 822-1 resin. Do not thin with solvent.

Armor Flake 822-3 Sealing Coat

  • 1Armor Flake 822-3 is applied by stiff brush, roller, trowel or wide putty knife. 4 inch bristle brushes with non-painted handles and long nap roller is suitable for use with acetone and MEK are recommended for application.
  • 2AF 822-3 may be applied after the AF 822-2 Lining is hard to the touch.
  • 3To obtain a non-skid surface, sprinkle clean, sharp sand on the Armor Flake 822-3, coat while it is still soft.
    Completely cover the surface with the sand, and after the resin has set, sweep off any loose, excess sand.
  • 4Allow approximately 12 hours of cure time before the lining is placed in service.
  • 5Use Armor Clean, acetone, or MEK to clean equipment and brushes used in the mixing and application. DO NOT thin Armor Flake 822 components with Armor Clean, acetone or MEK.


The Armor Flake 822 Lining System is not recommended for large concrete areas.


Armor Flake 822 components are available in stock sizes of 1-quart, 1-gallon and 5-gallon, with Armor Plate 60 catalyst in a separate container.

Coverage and Estimating

The theoretical coverage of the Armor Flake 822 components

AF 822-1 Primer 100-150 sq. ft./gal (Depends on surface texture)
AF 822-2 Lining 30-40 sq. ft./gal (provides 40-50 mil thickness)
AF 822-3 Sealing Coat 100 sq. ft./gal (Depends on surface texture)

Shelf Life

Armor Flake 822 components have a shelf life of approximately 3 to 6 months when stored under dry conditions, around 75 °F.

Freight Classification

Resin Solution, Flammable Liquid


For Industrial Use Only! – Flammable Liquid

Resin Component

  • Causes eye or skin irritation. Always wear suitable clothing to minimize skin Contact.
  • Vapor caused headache, dizziness, nausea and unconsciousness. Area must be ventilated. If inhaled, remove victim to fresh air. Give artificial respiration if not breathing.
  • For eye Contact, flush with water immediately.
  • For skin Contact, wash with soap and water immediately. Remove contaminated clothing.
  • If swallowed, give large amounts of milk or water to drink and seek immediate medical attention.
  • Flammable. Keep away from all sparks, flames or heat. Extinguish fires with foam, dry chemical, carbon dioxide or water spray.

Hardener – AP 60 (Methyl Ethyl Ketone Peroxide)

  • Store in a cool place away from all sources of heat.
  • NEVER store near cobalt naphthenate or other promotors, accelerators or strong reducing agents.
  • Strong irritant. Ingestion can be fatal. If swallowed, induce vomiting and call physician.
  • For eye contact, flush with water for 30 minutes and call physician immediately.
  • For skin contact, wash with soap and water immediately. Remove contaminated clothing.

Before use, review Material Safety Data Sheet for further information. Read and follow the hazard information and first aid directions on each product label before using.