• 5 Gallon Units with kit yield of 6.25 gallons (5 gallons of product to be pre-accelerated with 1 vial of Promoter and then mixed with 1.25 gallons potable water to yield 6.25 mixed gallons).
  • VOC compliant
  • Excellent waterproofing coating
  • 500% elongation
  • Permanently flexible
  • Easy application over a variety of substrates
  • Fast curing for quick recoat times
  • Manufactured in WHITE, but able to be pigmented in any STANDARD ROCKTRED COLOR using UNIVERSAL COLORANTS
  • Highly resistant to thermal cycling


ELASTI-THANE MEMBRANE WB is a solvent free single component water catalyzed polyurethane membrane coating with high tensile strength and greater than 500% elongation.



ELASTI-THANE MEMBRANE WB is typically used as a permanently flexible waterproofing membrane, as a crack bridging coating or as a base coating under ROCK-TRED SOFT FLOORING SYSTEMS on jobsites where solvent odors are not permitted.


Typical Coverage

ELASTI-THANE MEMBRANE WB can be applied as a neat coat up between 65 - 100 square feet per gallon. ELASTI-THANE MEMBRANE WB can be applied as a slurry application by extending the liquids with up to 10 pounds of PCA322 aggregate per mixed gallon to increase volume and viscosity.


Physical Properites

Volume mix ratio 4:1 (Resin to potable water)
Solids Content (%) 93% solids
VOC < .07 lbs./gal (ASTM D-2396-81)
Hardness (ASTM D-2240) 60 (Shore A)
Application Temps. 60° – 85° F
Gel Time 30 minutes @ 75°F
Dry to Touch (recoat with similar product) 2 - 4 hours @ 75°F
Open for Light Traffic 24 hours @ 75° F
Shelf Life 6 months in unopened units

Limitations & For Best Results

  • Do not thin this product beyond recommended ratio
  • Avoid applications in high temperature / high humidity as product will catalyze rapidly
  • Always apply over a ROCK-TRED primer and not direct to concrete. Light aggregate seeding into the primer is recommended.
  • Allow each coat to dry to tack-free prior to recoating
  • When re-coating, always apply the next coat within 24 hours of completing the previous coat.
  • Do not use as a finish coating as this product has low abrasion and UV resistance.
  • TWO STAGE MIXING AND INDUCTION TIME IS NECESSARY. Always mix according to instructions below.
  • This product may produce an oily/slimy surface film during cure under certain conditions. Check the cured surface for this “blush” prior to application of subsequent coatings. If present, scrub with warm soapy water, rinse with clean water and allow to completely dry before continuing.



Product Application


Use a mechanical mixer with spiral blade at low RPM to premix the Resin material thoroughly to a uniform color. Add Promotor (1 vial per 5 gallons of WB MEMBRANE resin) and mix to a homogeneous mixture/color and allow to stand for 5 minutes. When ready to apply add 1 quart potable water per gallon of pre- accelerated MEMBRANE resin and mix until a homogeneous mixture is achieved. Apply to substrate using squeegee or notched trowel. Back rolling product is acceptable when necessary, but not recommended as rolling may entrain air.


Color and Textures

ELASTI-THANE MEMBRANE WB is manufactured in an opaque white color base, but may be pigmented with UNIVERSAL COLORANTS. Do not exceed two BagPak Units of Universal Colorant per 6.25 gallon unit. Most ROCK-TRED products are available in a wide range of textures using an appropriate aggregate.


Chemical Resistance

Always refer to ROCK-TRED’s chemical resistance chart for specific information on each product / system or contact ROCK-TRED directly.


Product Storage

DO NOT allow ROCK-TRED products to freeze. All ROCK-TRED products should be properly stored above the floor on pallets or shelves, and in an area that has a constant minimum temperature of 50° F (10° C).


Surface Preparation

Always apply ROCK-TRED products to a clean / sound substrate that is free of laitance, grease, oils, debris, and curing compounds. Concrete substrates should be cured for a minimum of 28 days prior to application of product [except as otherwise noted on the individual Product Data Sheet]. Whenever possible, remove existing coatings and/or flooring systems completely; if complete removal is not possible always perform tests to determine adhesion and compatibility to the existing flooring. Mechanical surface preparation by means of a diamond grinder or shot-blasting machine is the best and recommended method for attaining the desired profile. If the substrate is not properly prepared and the appropriate profile is not achieved, failure of the product to adhere to the substrate may occur.


Clean Up

Application tools and equipment can be cleaned with soap and water immediately after use, or with solvent once the product has begun to cure.



Product containers will contain product residue and must be disposed of properly. Label warnings must be observed at all times. All containers must be disposed in accordance with federal, state, and local regulations.


Important Notice

Always read and acquaint yourself with ROCK- TRED’S Product Data Sheet, SDS [safety data sheet], and product labels for each individual product prior to mixing and prior to use. For further assistance, product questions, additional information and/or unexpected or unusual installation conditions – contact your Area Sales Representative or ROCK- TRED directly for recommendations. Kit components are pre-measured for optimal performance. Catalyzation errors due to incorrect mixing in the field voids product warranty.