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  • Overview
  • Specs
  • Coverage Rate
  • Cure
  • Chemical
  • Application

Underwater Pourable Concrete Crack Repair Epoxy

UW602 is a two component 100% solids pourable gel epoxy designed for repair of cracks (not hairline) and defects in concrete, cement or masonry under water or on wet substrates on either vertical or horizontal surfaces.  UW601 is designed for applications where where contamination from water cannot be controlled or for underwater repairs and applications. Available in 3 gallon and 15 gallon kits.

PRIMER: None required

TOPCOAT: None required.

 Where is Underwater Pourable Concrete Repair Epoxy Used?

  • Underwater or Wet Substrate Repairs
  • Concrete, Cement & Masonry Surfaces

Why UW602 Underwater Crack Filler Epoxy?

  • Make Repairs Underwater or on Wet Surfaces
  • Concrete, Cement and Masonry
  • Both Horizontal & Vertical Repairs
  • Good for Cracks and Wide Variety of Repairs
  • Easy to Use Pourable Formula
  • 100% solids with 0 voc
  • Low odor


Solids By Weight 100%   By Volume 100%
VOC 0 g/L
Color Light Tan after mixing
Recommended Thickness Variable – not for thin crack repairs
Coverage per Gallon 0.13 cubic feet or 1,228 lineal feet @1/8″ x 1/8″
Packaging 3 gallon kit, 15 gallon kit
Mix Ratio 2:1 mix ratio by volume
Shelf Life 12 months in unopened container
Hardness Shore D = 83
Viscosity Mixed = 187,000 cps (typical)
Shrinkage Neglible due to 100% solids formulation
Compressive Strength 9,440 psi (ASTM D695)
 Flexural Strength 4960 psi (ASTM D-790)
 Tensile Strength 4,114 psi (ASTM D-412)
 Ultimate Elongation 3.1% at 70F
 Gardner Variable Impactor 50 inch pounds direct – passed
 Heat Deflection Temp 59.4 degrees C (138 degrees F)
 Adhesion 395 psi (elcometer) – no delamination/concrete failure


Coverage Per Gallon 0.13 Cubic Feet Or 1,228 Lineal Feet @1/8″ X 1/8″


Pot Life – 1-1/2 gallon mix 15 – 25 minutes
Tack free (dry to touch) 6 – 10 hours
Recoat or topcoat 10 – 16 hours
Light foot traffic 16 – 24 hours
Full cure (heavy use) 3 – 7   days



 Butanol C
 Ethyl alcohol C
1,1,1 Trichlorethane C
 Methanol A
 Xylene C
 Skydrol B
 10% Sodium Hydroxide D
 50% Sodium Hydroxide C
 10% Sulfuric Acid C
 70% Sulfuric Acid A
 10% HCI C
5% Acetic Acid B

Rating Key: A – Not Recommended, B – 2 Hour Term Splash Spill, C – 8 Hour Term Splash Spill, D – 72 Hour Immersion, E – Long Term Immersion.


1) PRODUCT STORAGE: Store product in an area so as to bring the material to normal room temperature before using. Continuous storage should be between 50-90°F. Avoid low temperatures and large temperature fluctuations in storage as these conditions could cause possible product crystallization.

2) SURFACE PREPARATION:  The most suitable surface preparation would be a fine brush blast (shot blast) to remove all laitance and provide a suitable profile. All dirt, foreign contaminants, oil and laitance must be removed from within the expansion joint to assure a trouble free bond to the substrate. However, this product can successfully be applied to damp, wet or even underwater substrates.

3) PRIMER: No primer is necessary.

4) PRODUCT MIXING:  This product has a mix ratio of two parts A to one part B by volume. Normally, the product comes supplied in pre-measured kits. The most accurate way to measure mixing proportions would be by weight (11.6 pounds part A to 5.65 pounds part B although volume ratios at 2: 1 can be utilized). We highly recommend that the kits not be broken down unless suitable weighing equipment is available. After the two parts are combined, mix well with slow speed mixing equipment such as a jiffy mixer until the material is thoroughly mixed and streak free. Make sure to scrape the sides and bottom of the mixing container thoroughly when mixing. Water will not impede the cure mechanism for this product. Improper mixing may result in product failure. For best mixing results and proper blending of parts A and B, recommend a Jiffy Mixer style drill mixer.

5) PRODUCT APPLICATION:  The mixed material can be applied by pouring the mixed material directly into the crevice or expansion joint to be repaired. Remove any excess material with a putty knife or similar tool when not underwater. If applying the material underwater, then remove any excess with a scraper type tool after is has partially set up and tacked off. Because of the vastly differing types of applications possible for this product, we recommend that a representative sample be placed and evaluated prior to commencing any large job application. When applying this material underwater, make sure that the material displaces all water beneath the application to assure contact with the substrate which will create a proper bond. The density of the material is greater than that of water and should force out the water when poured into the expansion joint. This product is not intended for small type hairline cracks. When applying material in an expansion joint, a suitable backer rod can be used provided it is not made of material that will absorb water.

6) RECOAT OR TOPCOATING:  This product can be applied in successive applications. Topcoating with other products are normally not performed underwater. Always remember that colder temperatures will require more cure time for the product before recoating can commence.

7) RESTRICTIONS:  Restrict the use of the floor to light traffic and non-harsh chemicals until the coating is fully cured (see technical data under full cure). 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.

8) CLEANUP:  Use xylol


  • Color stability may be affected by environmental conditions such as immersion service, temperature, or chemical exposure.
  • Colors may vary from batch to batch. Therefore, use only product from same batch for an entire job.
  • This product is not UV color stable and will discolor when exposed to UV rays or some indoor lighting such as sodium vapor lights.
  • All new concrete must be cured for at least 30 days prior to application.
  • It is advisable to place test patches prior to undertaking underwater or water contaminated repairs to insure product and surface compatibility.
  • The temperature of the water may increase or decrease the time for the material to cure, dependent on the temperature of the water.
  • Physical properties listed on this technical data sheet are typical values and not specifications.

NOTICE TO BUYER: DISCLAIMER OF WARRANTIES AND LIMITATIONS ON OUR LIABILITY We warrant that our products are manufactured to strict quality assurance specifications and that the information supplied by us is accurate to the best of our knowledge. Such information supplied about our products is not a representation or a warranty. It is supplied on the condition that you shall make your own tests to determine the suitability of our product for your particular purpose. Any use or application other than recommended herein is the sole responsibility of the user. Listed physical properties are typical and should not be construed as specifications. NO WARRANTY IS MADE, EXPRESSED OR IMPLIED, REGARDING SUCH OTHER INFORMATION, THE DATA ON WHICH IT IS BASED, OR THE RESULTS YOU WILL OBTAIN FROM ITS USE. N0 WARRANTY IS MADE, EXPRESSED OR IMPLIED, THAT OUR PRODUCT SHALL BE MERCHANTABLE OR THAT OUR PRODUCT SHALL BE FIT FOR ANY PARTICULAR PURPOSE. NO WARRANTY IS MADE THAT THE USE OF SUCH INFORMATION OR OUR PRODUCT WILL NOT INFRINGE UPON ANY PATENT. We shall have no liability for incidental or consequential damages, direct or indirect. Our liability is limited to the net selling price of our product or the replacement of our product, at our option. Acceptance of delivery of our product means that you have accepted the terms of this warranty whether or not purchase orders or other documents state terms that vary from this warranty. No representative is authorized to make any representation or warranty or assume any other liability on our behalf with any sale of our products. Our products contain chemicals that may CAUSE SERIOUS PHYSICAL INJURY. BEFORE USING, READ THE MATERIAL SAFETY DATA SHEET AND FOLLOW ALL PRECAUTIONS TO PREVENT BODILY HARM.