Flexible Cement II™ Cartridge Application Instructions

STOP: See Cartridge Assembly Instructions First.

Tools RequiredControl JointsSpall and Crack RepairTrouble ShootingRecapping and Reusing Cartridge

flexible-cement-cartridge-flipSome components of this material may have settled in shipping and storage. This natural occurrence may cause color striations. These striations will not effect the performance of the repair and are cosmetic only. To reduce striations, re-blend material, invert the cartridge at 2 minute intervals, several times before use as shown in the diagram above.



Safety Glasses


Safety Glasses


Shop Vacuum


Margin trowel and knife.


Razor Scrapper


Angle Grinder with diamond blake.


Manufactured sand or quartz. 4030 grit of similar.


Roadware 300x300ml dual cartridge application tool. #5300

Goal: to protect the joint from deterioration due to heavy traffic and to allow for stress relief and controlled cracking. Concrete must be fully cured with time allowed for maximum shrinkage for best results. Minimum concrete cure time is 28 days for most situations.

flexible-cement-grinder-saw-prepClean the control joint with a powered wire grinder or re-saw with a dry concrete blade to mechanically remove all latents, dirt and debris.

flexible-cement-joint-vacuumCarefully vacuum the joint to remove concrete dust. It may be necessary to wipe the joint with an alcohol moistened lint free cloth to remove dust.


For maximum protection, apply material at full depth. Silica sand may be used to stop material from flowing into the substrate. See control joint depth chart for details.


Carefully apply material with a gentle pumping action. Slightly overfill the joint.


After material is fully cured, (in about 10 to 20 minutes), slice off over banding with a razor sharp scraper





Clean repair area with a wire wheel or needle scaler. Remove all dirt, oils, and loose debris.



Remove any dust with a vacuum or compressed air.



Flood repair area with Roadware Flexible Cement II. Clean, dry aggregate may be added to spalls greater than 1 inch deep.



Repair may be worked with a scraper immediately after application. Sand may be added to thicken material and work on graded surfaces.



OPTIONAL: Just before material sets, add an even, light coat of colored sand to the top of the repair. The sand will create a non-skid surface and will allow the repair to blend in with the existing concrete. The color of the sand will determine the color of the repair. Standard silica sand is not recommended due to its lack of color opacity.


Every reasonable effort is made to insure that every cartridge of Roadware 10 Minute Concrete Mender™ is easy to use and trouble free. Below is a list of possible problems, their causes and suggested solutions. For more information, please call Roadware Technical Service at 800-522-7623 or e-mail us at support@concretemender.com.



Possible Cause


Material does not cure. Material was not mixed properly Make sure all start-up procedures are followed. Check for any blockage of cartridge openings.
Material is slow to cure Low ambient temperature This material will set in approximately 10 minutes at 72° F. Cooler concrete and sand temperatures will increase cure time.
Cartridge is hard to pump or surges off ratio. Rear plunger is sticking. Slight leakage (mostly found in partially used cartridges) has caused the “A” (light colored) material to crystallize on the plunger causing sticking and surging. Carefully rim the skirt of the plunger seal with a small, flat screwdriver.
Material has cured inside the static mixer or Flow Controller. Replace static mixer and Flow Controller if needed.
Cured material shows intensive marbling and striations.  Inadequate mixing. Follow start up procedures carefully. Warm-up and re-suspend the pigments inside the cartridge by flipping over every few minutes. Make sure all air pockets are bled off before application. Use medium even strokes when applying material.
Material foams, bubbles, or grows when curing. Moisture is in contact with the material. When concrete is damp or green, dry with a heat gun or propane torch. Apply a layer straight 10 Minute Concrete Mender™ to the area. Allow to cure and continue the repair.


Clean up

Wipe tools clean with a rag before material is allowed to cure. Cured material may be removed by abrading with a wire brush or soaking in acetone, xylene, MEK, or epoxy thinner. USE EXTREME CARE WHEN WORKING WITH INDUSTRIAL SOLVENTS.

10 Minute Concrete Mender™ is very aggressive and will stain exposed skin. Gloves should be worn to keep material from contacting skin. In the event of skin contact, remove immediately with an industrial paint and stain hand cleaner.



Disposal Methods

Empty cartridges may be disposed of with normal waste disposal methods in accordance with Federal, State, and local environmental control regulations.

Unused material is best disposed of by mixing equal parts of side A and side B and allowed to cure in a waste container. Cured material may then be disposed of with normal methods.

ACTION TO TAKE FOR SPILLS/LEAKS: Properly protected personnel should contain spill. Ventilate area, cover spill with sawdust or other absorbent material. Scoop and place in open container and treat with decontamination solution (93% water, 5% ammonia, 2% detergent). Leave open in a ventilated area for 24 hours.

DISPOSAL METHOD: Bury or landfill decontaminated waste in accordance with Federal, State, and local environmental control regulations.





Hold cartridge sideways over a waste container and remove retaining nut and mixer.

Bleed off a few drops of material to clear out any cured product.


Hold cartridge upright and place D-rings into the top ports. Place overcap on cartridge.
Store upright in a cool, dry place. Material will remain usable for a varying amount of time depending on the moisture level of the storage. Signs of moisture contamination are heavy caking and crystallization of the A-side material at the D-rings and the rear seals.

To reuse cartridge, follow normal start-up procedures.


Workers may be exposed to dangerous levels of silica dust when cutting, drilling, grinding, or otherwise disturbing materials that contain silica. These materials and tasks are common on construction jobs. Breathing that dust can lead to serious, often fatal illnesses.  Click here to learn how to work safely with silica.

Commercial and Industrial Concrete Repair Products