Armor Plate 901 is an epoxy resin system specifically designed to bond freshly mixed concrete to an existing concrete layer. AP 901 is also excellent for bonding steel, non-skidding steel decking, wood, brick, aluminum, stone, and various other materials.
As a general purpose epoxy resin, AP 901:

  • provides a moisture and chemical barrier for concrete structures.
  • repairs spalled areas on concrete.
  • secures anchor bolts and equipment bases.
  • when mixed with suitable aggregate, provides a non-skid, chemical resistant floor coating for stairways, walkways, bridges and loading docks.

Armor Plate 901 is a versatile material used in many applications where its bonding and sealing characteristics are needed. AP 901 will meet or exceed the standards of ASTM C-881 for Type I, II and III and Class C.

Chemical Resistance

Armor Plate 901 has excellent chemical resistance to mild acids, 50% caustics, solvents, salts, oils and steam. Contact the Wil-Cor, Inc. Technical Department for chemical resistance of Armor Plate 901 in specific service conditions.


  • Resistant to moisture and chemicals
  • Bonds to almost every material
  • Can be used as a concrete repair material
  • Provides ideal floor coating for high traffic areas
  • Non-critical mixing ratios
  • Long pot life for easy application

Physical Properties

Color Amber
Solids Content 100%
Resin (part A) 185 °F
Cure (part B) 200 °F
Consistency Heavy Oil
Mixing Ratio (by vol.) Resin (pt A) : Cure (pt B) 1 : 1
Pot Life @ 75 °F 1 hr
Cure Time @ 75 °F 12 – 36 hours
Operating Temperature Range
Continuous low -275 °F
Continuous High 190 °F
Shear Bond Strength 625 psi
Tensile Strength 400 psi
Compression Impact Strength 8,000 psi
Flexural Strength 375 psi
Impact Resistance 1.6 ft-lbs

Surface Preparation

For Concrete:

  • 1Remove all foreign matter, old coatings, patchwork or surface contamination. This includes dirt, grease, salts or form oil.
  • 2Remove all sand, dust, standing water and debris.

For non-skidding steel decking:

  • 1Remove old coatings and surface contamination such as oil or grease, using detergents, or solvents.
  • 2Remove any rust or oxidation. Sandblast the surface to a near white metal.
  • 3Remove any sharp edges or protrusions by grinding, chipping, or other methods.
  • 4Remove all sand, dust, standing water and debris.


The Armor Plate 901 mixing ratio, by volume, is 1 part Resin (part A) to 1 part Cure (part B). Pour the two components into a clean container and stir until a homogenous mixture is obtained. Proper mixture is obtained after approximately 2 minutes stirring with a low speed power mixer, or 3-5 minutes with a hand-stirred wooden paddle.

If the AP 901 is to be applied as a spray, thin the mixture with a 50/50 mixture of methyl ethyl ketone and xylene. The maximum amount of thinner that can be used is 10% of the total weight of the AP 901 mixture. Allow 2-4 hours for the solvents to evaporate before pouring concrete.

When bonding new concrete to old concrete, apply Armor Plate 901 to the old concrete surface just prior to pouring the new concrete. DO NOT allow AP 901 to cure before pouring new concrete.


Armor Plate 901 may be applied with a brush, roller, or spray equipment. If spray equipment is used, allow 2-4 hours for the thinner solvents to evaporate before pouring concrete.

When bonding new concrete to old concrete, apply Armor Plate 901 to the old concrete surface just prior to pouring the new concrete. DO NOT allow AP 901 to cure before pouring new concrete. As long as AP 901 is tacky to the touch, good adhesion will be attained. If AP 901 cures prior to pouring the new concrete, apply another coat of Armor Plate 901 onto the cured coating.

When using AP 901 bonding agent, new concrete may be poured in thin layers (1/4″ to 1/2″) to create a “feathered edge”.

Cure time will vary with the temperature, humidity and service conditions. The chart below indicates a typical cure cycle for AP 901.


Armor Plate 901 is available in stock sizes of 2-quart, 2-gallon and 10-gallon units.

Coverage and Estimating

The estimated coverage of AP 901 is 125 sq. ft./gal. at a 10 mil thickness. Material losses during mixing and application must be considered when estimating.

Material Requirements for Grouting Dowels

Material Requirements for Grouting Dowels
Diameter (inches) Area (sq. in.) Diameter (inches) Area (sq. in.)
0.25 0.05 2.25 4.00
0.50 0.20 2.50 4.90
0.75 0.45 2.75 5.95
1.00 0.80 3.00 7.05
1.25 1.25 3.25 8.30
1.50 1.75 3.50 9.60
1.75 2.40 3.75 11.05
2.00 3.15 4.00 12.55
1″ dowel in a 1.5″ hole that is 12″ deep
How much grout is needed?
From the chart above:
1″ dia. dowel: 0.80 sq. in.
1.5″ dia. hole: 1.75 sq. in.
Void area (area to be filled with grout):
(1.75-0.80) sq. in. = 0.95 sq. in of void area.
0.95 sq. in. X 12 in. = 11.4 cu. in. of grout needed.
Miscellaneous Data
1 gal. = 231 cu. in. 1 gal. = 144 sq. in.
1 gal. = 128 fl. oz. 1 sq. yd. = 9 sq. ft.
7.5 gal. = 1 cu. ft. 1 mil = .001 in.
1 cu. ft. = 1728 cu. in. 100 lbs. sand = approx. 7 gal.

Shelf Life

Armor Plate 901 has a minimum shelf life of one year when stored in tightly sealed containers in a dry location. AP 901 may keep up to 4-5 years. After one year shelf life a test batch of AP 901 should be made to determine its acceptability. Freezing or temperatures in excess of 110 °F will not affect the shelf life.

Freight Classification

Plastic Liquid, N.O.S.
F.O.B. – Pasadena, Texas
May be air freighted.


  • Causes eye irritation.
  • May cause allergic skin reaction.
  • Avoid breathing vapor or mist
  • Do not get into eyes, on skin or clothing.