Vapor-Tek® 440 Concrete Stains

100% solids, two-component epoxy coating designed to control moisture vapor emission rates up to 20lb. / 24 hr / 1,000 ft. prior to the application of flooring.

  • Coverage Up to 100 sq. ft. per gallon square feet
  • Coats 1
  • VOC Content 0 g/L
  • Finish Gloss
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A revolutionary, 100% solids, two component epoxy coating designed to control moisture vapor emission rates up to 20 lb / 24 hr / 1,000 ft, prior to the application of epoxy floor systems, vinyl, rubber, tile, cementitious overlays, terrazzo, wood, or carpet. Vapor-Tek 440 reduces the permeance of moisture vapor through concrete substrates to levels that are acceptable for the installation of resinous floor coatings. The high performance and quick installation features of this system make it an ideal solution. Meets ASTM F3010 for vapor permeance.


Exceptional when used for:
  • Applications: Basements, floors where vapor of porous concrete surfaces needs to be controlled
  • Substrates: Concrete
Not for use on:
  • For interior use only



  • Helps reduce effects of moisture vapor transmission
  • One coat application
  • May be used as a primer to an epoxy floor system or stand-alone product before applying flooring


  • Ensures protection of moisture sensitive floor coverings
  • Stops dusting
  • No VOCs
  • Will form an excellent bond to concrete


  • Meets ASTM F3010
  • Easy to use
  • Can be applied to concrete 10 days old
  • Fast-curing

Vapor-Tek 440 Rises Above

Vapor-Tek 440 meets or exceeds the following tests:

  • ASTM F3010: Standard Practice for Two-Component Resin Based Membrane-Forming Moisture Mitigation Systems for Use Under Resilient Floor Coverings

Moisture Vapor Transmission Reduction Percentage Improvement vs. Control

Vapor-Tek 440
Sealer Product

Auxilliary Information

  • Technical Specs

    • Feature: Moisture vapor barrier system
    • Chemistry: 100% solids epoxy
    • Color: Clear
    • Finish: Gloss
    • Category: Coating
    • Carrier: 100% solids
    • Availability: 2 component kit
    • Packaging: 3 Gallon Kit
    • Coverage: 100 sq. ft. per gallon at 17 mils
    • Interior/Exterior: Interior
    • Application Method: Roller
    • Application Temperature: 60 F - 90 F
    • Number of Coats: 1
    • New Concrete: Yes, at least 10 days after being poured
    • Storage/Shelf Life: 1 Year
    • Clean up: Xylol
    • VOC Content: 0 g/L
    • Film Thickness: 17 mils
    • Adhesion: 350 psi
    • Viscosity: 700 cps
    • Primer: None

    CURE TIMES: (70F)

    • Pot Life – 1 gallon volume: 30-40 minutes
    • Tack Free (dry to touch): 6-10 hours
    • Recoat or Topcoat: 12-16 hours
    • Full Cure (Heavy Traffic): 3-7 days
  • Preparation

    Avoid contact with skin, eyes and clothing. Wash hands after use and do not take internally. Please refer to the product Safety Data Sheet (SDS) before using. The preparation process should be followed to ensure adequate penetration and optimum performance:

    Step 1: The concrete substrate must be structurally sound and clean.

    Step 2: Remove all paints, previous sealers and/or adhesives before application.

    Step 3: The substrate must be clean of oil, grease, dirt, wax, curing compounds, efflorescence and other contaminants that might interfere with the penetration of the sealer.

    Step 4: A surface profile of a CSP 3 or 4 is recommended prior to installing the Vapor-Tek 440 by mechanical scarification until a suitable profile is achieved.

    Step 5: Perform moisture vapor transmission testing per ASTM F1869 (calcium chloride) to verify that the vapor pressure is below 20lb/24hr/1000ft2 or above 75% and below 95% (relative humidity) per ASTM F2170.

    Step 6: Cover all surrounding areas not intended to be coated.

    Step 7: New concrete must be cured for at least 10 days before sealing.

  • Mixing

    Step 1: Standard packages are in pre-measured kits and should be mixed as supplied in the kit. We highly recommend that the kits not be broken down unless suitable weighing equipment is available.

    Step 2: Mix each individual component before using. Mix part A and part B together with slow speed mixing equipment such as a jiffy mixer until the material is thoroughly mixed and streak free. Avoid whipping air into the liquids.

    Step 3: After mixing, transfer the mixed material to another pail (the transfer pail) and again remix before applying to the concrete substrate. Improper mixing may result in product failure.

  • Application

    Step 1: The mixed material can be applied by brush or roller. However, the material can also be applied by a suitable serrated squeegee and then back rolled as long as the appropriate thickness recommendations are maintained. When applying by serrated squeegee, back roll the material at a right angle to the direction of the squeegee application.

    Step 2: Maintain temperatures and relative humidity within the recommended ranges during the application and curing process. Do not use any heating equipment that would produce carbon dioxide.

    Step 3: When rolling out the product, it is best to roll out the product in one direction and then back roll the material in the opposite direction to make sure it is worked into the concrete well. If concrete conditions or over aggressive mixing causes air entrapment, then an air release roller tool should be used prior to the coating tacking off to remove the air entrapped in the coating. When the mixed material is applied to the concrete surface, pin holes or voids may develop when air is displaced (outgassing). If voids or pin holes occur, re-application to remove them must be undertaken. Grind these areas and clean off residue; make sure the surface is dry and re-coat. Thinner applications than recommended may result in insufficient moisture vapor protection.

  • Coating

    Concrete treated with Vapor-Tek 440 can be covered with wood flooring, tile, carpet or an epoxy floor system. For proper adhesion, use a product or primer suitable for application over a non-porous surface when applying to the moisture vapor product. Wait at least 12-16 hours before applying flooring, coatings, overlays, or other surfacing before the material is properly set up. Cooler temperatures or a colder substrate might need additional curing time. Usually, the degree of cure is sufficient when you can firmly press down on the coating with your thumb and leave no marking. The maximum recoat window for the Vapor-Tek 440 is 48 hours.

  • Application Notes

    • Vapor-Tek 440 should not be used as a final wear surface.
    • Do not use over lightweight concrete such as gypsum based underlayments.
    • Product color may vary from batch to batch.
    • This product is not UV color stable.
    • Color stability may be affected by environmental conditions such as high humidity, chemical exposure or certain types of lighting.
    • Substrate temperatures must be 5°F above dew point.
    • For best results, apply with a high quality roller.
    • All new concrete must be cured for at least 10 days prior to application with a minimum compressive strength of 3,500 psi and a minimum tensile strength of 200 psi.
    • Testing must be performed to confirm a moisture vapor emission rate below 20lb/24hr/1000ft2 per ASTM F1869 or between 75% and 95% for ASTM F2170.
    • Surface must be durable, clean, free of laitance with a surface profile minimum of CSP Level 3.
    • Do not expose this product to water until fully cured.
    • Product is not suitable for preventing hydrostatic water conditions.
    • Manufacturer is not responsible for entrapped moisture and/or water underneath applied coatings with a low rate of water vapor transmission which can deteriorate concrete resulting in a cohesive failure within the concrete surface.
    • Product will not prevent failures from insufficient surface preparation, improper applications, alkaline silica reaction (ASR), iconic compounds or soluble salts in the concrete.
    • Manufacturer is not responsible for failures caused by cracks and pin holes or damage caused by use. Cracks and joints are not covered by any warranty.
    • Product is not warranted for any products not recommended by or manufactured by the vapor barrier manufacturer.
    • Any un-reacted alkaline silicate compounds within the concrete can result in osmotic action/water vapor transmission that will channel these water soluble compounds to the surface where they can effectively break the bond of the applied system as well as preventing penetration of the coating into the substrate.
    • Slabs must be at least 4” thick with a functioning vapor barrier.
    • Restrict the use of the floor to light traffic and non-harsh chemicals until the coating is fully cured. It is best to let the floor remain dry for the full cure cycle. Dependent on actual complete system application, surface may be slippery, especially when wet or contaminated; keep surface clean and dry.
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