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Mend-Con RTU Concrete Repair | Apply Underwater | Vertical No Sag | Quick Cure | Paintable | Low Temp 40˚F | Case of 12

Mend-Con RTU is a two component, 100% solids, high strength ceramic blend epoxy all purpose concrete and masonry wet condition and underwater repair product.   It’s highly versatile and will bond and cure in wet conditions.  Even perform repairs and apply under both saltwater and freshwater, no problem!

With its no sag formula, Mend-Con RTU works well on vertical and overhead repairs as well as traditional horizontal surfaces.  Offers a quick cure, dry to the touch in 15 minutes and topcoat with most any paint or coating in as soon as 1 hour and drive over with vehicle in 8 hours.

The resin and hardener are uniformly dispensed from a dual chamber cartridge system and mixed simultaneously through a mixing nozzle, providing users with a self mix delivery system.  A cartridge gun is supplied with each purchase.

This product has been determined to be exempt from USDA authorization. Construction and repair compounds may be used in U.S. Federally inspected meat and poultry plants as long as they are not applied to food handling surfaces.

Application temperatures: 40˚F to 100˚F ambient air and surface.  Can be applied to most any concrete, brick or wood porous surface.  Will adhere to smooth non-porous surfaces only after first roughing up with sandpaper before applying.  Apply up to 1″ at a time.  For deeper repairs wait at least 15 minutes before applying the next 1″ of Mend-Con RTU.   Great for wide variety of cracks, holes or joint repairs (not designed however for expansion type joint repairs).  Can used to fill a crack or space in newly poured concrete as soon as it is dry to the touch.  For application to top of newly poured concrete wait 60 days after concrete poured before using.

As a quick cure product, plan your work well before using as only have about 5 minutes working time to manipulate the product after dispensing the Mend-Con RTU material onto the surface.  Best to apply no more than 1″ thick at a time otherwise significantly slows down the curing process.

Comes in case of 12 cartridges 8.6 fluid oz each.  Each case comes with 1 cartridge gun and one plastic static mixer for each cartridge for proper application.

PRIMER: None required.

TOPCOAT:  Compatible with most any acrylic, epoxy, urethane or polyaspartic coating.   Can apply topcoat one hour after application at 70˚F.  To topcoat your underwater repair use our E591 Epoxy or consider the E100V Epoxy

Where is Mend-Con RTU Used?

  • Walkways
  • Entryways
  • Curbing
  • Railings
  • Garages
  • Walls
  • Fix trip hazards on sidewalks
  • Repair broken curbs
  • Fix cracks in stucco
  • Repair entryways to as-good-as-new condition
  • Fix stripped screw holes
  • Repair damaged walls
  • Fill holes
  • Repair foundation cracks
  • Fill voids around loose railings
  • Residential
  • Healthcare
  • Hotels/Resorts
  • Schools/Universities
  • Municipalities
  • Property Management
  • Office Buildings
  • Apartment Complexes
  • Nursing Homes
  • Shopping Centers

Why Mend-Con RTU?

  • Repair in Wet conditions – Apply Underwater
  • Great for Pool Repairs
  • High strength epoxy
  • Bonds to fresh or hardened concrete
  • No Sag No Drip Formula – perfect for Vertical, Overhead or Horizontal surfaces
  • Quick Cure Dries to touch 15 minutes, paint in 1 hour and drive on it in 8 hours (temperature dependent)
  • 2x as strong as most concrete – Compressive strength 8000 psi
  • Easy To Apply – Convenient ready-to-use cartridge system
  • Wide application temperature 40°F – 100°F
  • Paintable surface
  • Comes in Case of 12 Cartridges & Cartridge Gun
Mend-ConRTUBefore-AfterStepHoneycombStepRepair10minlabor opt
Color Light Gray
Packaging Cartridge 8.6 fl oz each (comes in case of 12 cartridges)
Shelf Life 12 months
Compressive Strength 8,000 psi
Temperature Range 40˚F to 100˚F
Cure Time Dry to touch 15 minutes, paintable 60 minutes, drive over 8 hours


Mend-ConRTUBefore-AfterStepHoneycombStepRepair10minlabor opt


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 and 90 degree F. Keep from freezing.


Surfaces to be bonded should be sound and cleaned so there is no dust, dirt, grease, wax, oil or any other contaminants present.
Smooth surfaces should be roughened with sandpaper or a wire brush before application.


  • Unscrew plastic cap and remove plug from threaded end of cartridge.
  • Place cartridge into a 10 oz caulking gun (Supplied with case of 12 cartridges)
  • Dispense a small amount of adhesive into a disposable container until both materials flow from the cartridge.
  • Attach mixing nozzle to cartridge and dispense a small amount of material into same disposable container until a consistent color with no streaks is obtained.
  • Cartridge is fully dispensed when the plunger reaches half way.


  • Apply an even coat of the mixed product to the clean and prepared surfaces. When bonding two surfaces together, make sure to fill all gaps between the mating surfaces.
  • For patching concrete or wood surfaces, fill the void with the epoxy adhesive to just above the surface level and trowel flush.

NOTE: Do not use for overhead or sustained load anchoring.

  • Dispense the material from the bottom of the hole. Fill approximately 2/3 of the hole depth while slowly withdrawing the nozzle.
  • Insert the threaded rod or rebar to the bottom of the hole while turning clockwise. The threaded rod or rebar should be free of dirt, grease, oil or other foreign materials.  Do not disturb or secure bolt to threaded rod or rebar until initial cure time has passed (3 hours at 75°F).


RESTRICTIONS:  Always use safety glasses and chemical resistant gloves when handling materials.


  • Substrate temperature must be 5°F above dew point.
  • Physical properties 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.

Mend-Con RTU Concrete Epoxy Cartridge REpair