Armstrong Flooring S-462 Seal Strong 2 Part Moisture Mitigation System DATA SHEET



Do not get in eyes, on skin, or on clothing.  Wash hands and exposed skin thoroughly after handling.  Contaminated work clothing should not be allowed out of the workplace.  Wash contaminated clothing before reuse.  Wear eye protection and gloves.  Avoid breathing dust vapors.  Use only outdoors or in well ventilated area.  Store in a well ventilated place.  Keep container tightly closed.  Dispose of contents/container in accordance with all federal, state and local laws.  Do not allow to enter drains.

    • IF INHALED:  Remove person to fresh air and keep at rest in a position comfortable for breathing.  If experiencing respiratory symptoms, call a doctor /physician.  
    • IF ON SKIN:  Wash with plenty of soap and water.  Take off contaminated clothing.  If skin irritation or rash occurs, get medical attention.
    • IF IN EYES:  Rinse cautiously wit water for several minutes.  Remove contact lenses, if present and easy to do. Continue Rinsing.  Get medical attention.
    • IF SWALLOWED:  Rinse mouth.  Do NOT induce vomiting.  Call a POISON CENTER or doctor/physician if you feel unwell. 


S-462 Seal Strong SDS

For Use With

  • Suitable on porous, unheated concrete slabs to reduce moisture vapor emission rates from 100% RH or 25 lbs/1000 sq. ft./24 hrs. to suitable levels before applying underlayment.
    Only one coat required to penetrate and to fully seal the substrate.
TypeSolvent-free two-part epoxy
ColorBlack (Part A resin), Yellow (Part B hardener)
ApplicatorNotched squeegee and short nap roller. For uneven surfaces use long nap roller and paint brush.
Coverageat 10 mils:  250-270 sq. ft. per mixed unit 
at 14 mils:  170-190 sq. ft. per mixed unit 
Units2-component system  Net 1.65 Gal. (6.25L)
Working TimeApproximately 20 minutes at 70° F (21° C)
Curing TimeMinimum 4 hours
Shelf Life12 months if unopened
Freeze/Thaw StableKeep from freezing
VOC Content19.9 g/L (parts A+B combined); ASTM D2369
Bonds ToPorous concrete surfaces with moisture limits of 100% RH per ASTM F-2170 or 25 lbs/1000 sq. ft./24 hrs. per ASTM F-1869.
AdvantagesSuitable for use up to 100% RH (or 25 lbs. CaCl), no PH limit
Only one coat is required to fully seal concrete.
Can be installed on top of Armstrong® Flooring S-466 Patch Strong
Longer working time and faster drying time
Size1.65 Gallon (Part A & Part B)
Carton Item No.00462101
Carton Dimensions10″L x 10″W x 16.25″H
Carton Weight25.2
Items per Carton1
Items per Pallet36


When used with recommended Armstrong Flooring products, the Strong System™ adds 10 years to the Armstrong Commercial Flooring Limited Warranty.

Substrate Preparation

Precautions: Contaminants like aggregates causing alkali-silica reaction (ASR), material constituents or reaction products, bond breakers such as curing compounds, deleterious salts, silicate based surface hardeners, and more may prohibit S-462 Seal Strong™ from working properly.  If it is unknown what types of treatments may have previously been applied to the concrete subfloor, the concrete should be tested to determine if any past treatments may jeopardize the use of S-462 Seal Strong™. The responsibility for conducting such tests lies with the building owner and/or its authorized jobsite crew.

Do not use moisture mitigation system on gypsum-based substrates.

External Water Sources: Armstrong Flooring S-462 Seal Strong is suitable for reducing concrete moisture vapor emissions rates of up to 100% RH down to a level acceptable for the installation of floor covering. Please note that a very high concrete RH level, tested per ASTM F2170, may indicate external water is present due to improper site grading/drainage or leaking/damaged pipes. Verify that any external sources of water are addressed prior to installation.

Moisture, Temperatures, and Dew Point: Concrete must be surface dry at time of installation. Conduct a mat test (ASTM D4263) on any concrete with an RH level above 98% for at least 4 hours to verify surface dry. Do not apply if concrete surface temperature is below 50°F (10°C). To avoid potential for condensation to form at time of installation, surface temperature must be at least 5°F (3°C) higher and rising compared to dew point for the given room temperature and humidity.

Tensile Strength of Concrete to Receive Armstrong Flooring S-462 Seal Strong: A minimum concrete tensile strength of 150 psi (ASTM C1583) is required for areas where the floor covering will undergo normal foot traffic. A minimum of 200 psi is required for areas where the floor covering will undergo heavy commercial traffic.

Surface Profile

  • All concrete substrates must be structurally sound and solid, surface dry and thoroughly clean and free of oil, wax, grease, asphalt, paint, latex compounds, curing and sealing compounds and any contaminant that could act as a bond breaker. 
  • Mechanical preparation of the surface is required to obtain a minimum ICRI concrete surface profile of 3 (CSP #3). Substrate preparation must be by mechanical means, such as shot blasting.  Broom sweep and vacuum the prepared surface.
  • Acid etching, solvents, sweeping compounds, adhesive removers and sanding are not acceptable means of cleaning the substrate.
  • Do not use moisture mitigation system on gypsum-based substrates.

If a concrete substrate is too uneven to provide a uniform film thickness of the Armstrong Flooring S-462 Seal Strong™ (typically CSP #6 or higher), the substrate can be pre-smoothed using Armstrong Flooring S-466 Patch Strong™ in certain situations. For substrate preparation and installation instructions regarding such an application, please contact the Armstrong Flooring Commercial Techline.

Joints and cracks:
Armstrong Flooring cannot be responsible for issues arising from expansion joints, isolation joints, saw cuts, and new or existing cracks that may develop or change in width after installing.  Honor all moving joints and moving cracks in the concrete up through the S-462 Seal Strong™ and Armstrong underlayment and floor covering by installing a fully flexible sealing compound intended for this use.  Dormant hairline cracks of up to 1/32” can be covered with S-462 Seal Strong®.  Dormant joints and dormant cracks greater than 1/32” that will not be honored must be pre-filled with a highly fluid 100% rigid-drying crack filling material such as Ardex ArdiFix™ intended for this purpose. Upon filling dormant cracks and dormant joints immediately broadcast the specified sand to refusal.  After curing thoroughly, remove excess sand prior to proceeding with S-462 Seal Strong™ installation.

Application Instructions

Mixing: Prior to mixing Part A and Part B, first thoroughly stir the contents of the Armstrong Seal Strong Part A container (resin). Next, pour the entire contents of the Armstrong Seal Strong Part B container (hardener) into the Part A container. Mix the blend for a minimum of 3 minutes using a low speed drill and epoxy paddle. Next, pour a portion of the blended epoxy back into the Part B container, and mix again for 30 seconds. Next, return all material back to the Part A container and mix again for 30 seconds.

CAUTION!  After thoroughly mixing, immediately pour the entire contents of the container onto the prepared concrete surface. Mixed material left in mixing container will generate heat. If occurs, do not touch container. Close lid loosely and carry container by handle to a cool space or to outdoors until it sets and cools.

The required thickness of application for S-462 Seal Strong™ is dependent on the thickness of flooring underlayment that will be installed on top of the S-462 Seal Strong™. 

  • Apply S-462 Seal Strong™ at 10 mils thick when the flooring underlayment will be up to 1/2” deep. 
  • Apply S-462 Seal Strong at 14 mils thick with sand broadcast for applications that will receive a flooring underlayment when the S-463 Level Strong will be up to 1-1/2″ deep.       

Apply evenly across the area at application thickness described above.  Spread with a saturated nap roller or notched squeegee.  Avoid moving too fast in order to allow S-462 Seal Strong™ to saturate the concrete surface.  Immediately begin to back roll to evenly distribute the epoxy film over the surface avoiding puddles. To minimize the potential for pinhole formation, work S-462 Seal Strong™ into the surface with the roller to ensure maximum penetration.  A paintbrush may be used for edges and corners. Coat the area completely prior to proceeding. Typically, only one coat is required to penetrate and to fully seal the concrete.  If experiencing gas bubble formation in the surface of the epoxy on extremely porous concrete, contact Armstrong Technical Service for guidance on applying a second coat of S-462 Seal Strong.

A sand broad cast is required for certain applications.  When required, sand broadcasting must take place while the S-462 Seal Strong™ is still wet (maximum 20 minutes). Note – Temperatures warmer than 70°F will cause the S-462 to cure more quickly and reduce the time available.

When planning to install S-463 Level Strong at a depth of up to 1/2”:  Allow a minimum epoxy drying time of 4 hours (max. 20 hours) at 70 °F. No sand broadcast is required. Prime with Armstrong S-465 NP Prime Strong prior to applying S-463 Level Strong. Installation depth with this method can vary from a minimum of 1/8″ to a maximum of 1/2″.

When planning to install S-463 Level Strong at a depth of up to 1-1/2″:  Broadcast an excess of fine sand into the wet epoxy material while wearing a NIOSH-approved dust mask in conformance with OSHA requirements for handling of sand (crystalline silica).  Sand must be clean and dry and less than 1/50” in grain size (98.5% passing sieve size #30 or #35).  Consistently cover the entire area with sand at a rate of approximately 1 lb. of sand per 1 square foot of area.  Do not stand or walk on the freshly applied epoxy while broadcasting sand.  Areas covered with sand may be walked on, taking care not to expose or disturb the epoxy.  After 4 hours, broom and vacuum to remove loose sand.  No primer is required prior to installing the Armstrong Flooring underlayment. Installation depth with this method can vary from a minimum of 1/8” to a maximum of 1-1/2”.

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Updated on October 14, 2022

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