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  • Specs
  • Cure
  • Application
  • Video

E343 Quick Fix Concrete Repair

E343 consists of a two component epoxy & urethane blended polymer concrete repair for random cracks, holes and spalling.  Exceptionally tough, strong concrete repair with quick 10-20 minute back in-service light foot traffic and 1 hour full service times. Great for cold weather application down 20°F or warm weather to 90°F (allow product to warm up to room temperature prior to application in cold weather projects).

Versatile repair product.  Its thin viscosity allows it to be poured directly into thin cracks.  For larger repairs, mix with silica sand which makes for even tougher repairs at lower out of pocket costs.

Apply to cracks and holes as deep as needed when using silica sand.  Not recommended for expansion joints.   Gray color (develops this color after curing complete).  Available in 2 complete patch kits packaged in a one gallon mixing container, 1 small patch kit with 8 oz of 2 part E343 and 6 lbs of blended silica sand and a large patch kit with 16 oz 2 part E343 and 12 lbs of blended silica sand.  Also available in liquid only options, 1 gallon and 2 gallon kits.

For larger area projects requiring a similar low viscosity, quick concrete repair product, see our 4034 Quick Concrete Repair available in 2 gallon and 10 gallon kits.

PRIMER: For patch work, can brush the E343 liquid on walls of the repair area just prior to applying the E343 repair.  This will allow for greater penetration into the concrete.

TOPCOAT: None required. However, many types of products can be used  as coatings or overlays for the area that has been patched.

 Where is E343 Concrete Crack Quick Fix Repair Used?

  • Concrete Cracks, holes, spalls
  • Concrete Thresholds
  • Uneven Concrete Slabs
  • Garage floors
  • Warehouse floors
  • Freezer floor projects
  • Cold weather projects

Why E343 Concrete Crack Quick Fix?

  • Extremely Quick full cure 1 hour
  • Tough Durable Repair as hard as concrete
  • Good for use interior & exterior repairs
  • Low viscosity Product for Outstanding Adhesion and Deep Penetration of Cracks
  • Comes in both small and large patch kits including silica sand and liquid only options
  • Use With Sand For Improved Performance and lower repair costs
  • Low viscosity (30 cps) Can be Used Without Sand to Penetrate Very Small and Deep Cracks
  • Great for cold weather application down 20°F or warm weather up to 90°F


Solids Nearly 100% cured
VOC 5.5 g/L cured
Color Gray after mixing and curing.  The gray color will not develop until the curing process takes place
Recommended Thickness Variable thickness with the use of any dry sand aggregate
Coverage per Gallon Coverage is dependent on hole size and amount of aggregate sand used.
Mix Ratio 1:1 mix ratio by volume
Shelf Life 12 months in unopened container
Hardness Shore D = 71 ASTM D 2240
Viscosity <30 cps (typical)
 Abrasion Resistance Excellent
Compressive Strength  4,400 (as a slurry with aggregate sand)
 Tensile Strength 4,500 psi
 Elongation at Break 5-6% ASTM D638
 Impact Resistance Excellent
Product type Polyurethane hybrid
Bond Strength (adhesion) Neat (no sand) 3800 psi and with sand 9,000 psi ASTM C882


At 70F

Working Time 1-4 minutes
Recoat time 1 hour
Light foot traffic 10-20 min
Heavy Traffic 1 hour

APPLICATION TEMPERATURE: 20-90 degrees F (lower temperatures require longer cure time)


PRODUCT STORAGE: Store product in an area so as to bring the material to normal room temperature before using. Continuous storage should be above 550 F to prevent product crystallization and prior to application best to allow product to warm up to room temperature in cold weather applications.

SURFACE PREPARATION:  All dirt, oil, dust, foreign contaminants and laitance must be removed to assure a trouble free bond to the substrate.  For repair of spalled concrete, a stiff wire brush can be used to remove all loose concrete. After wire brushing the spalled area, remove all loose dust and debris with an industrial vacuum.

PRIMER:  The material is self-priming. It is beneficial to discard a portion at the beginning to avoid unmixed material being used.

PRODUCT MIXING:  The product is mixed as it spirals its way through the static mixing tip.


  • Apply a thin layer of the mixed liquids from the cartridge set onto the concrete. For larger areas, it may be beneficial to use a small brush to spread the liquids to evenly cover the repair area.
  • Sprinkle dry sand onto the repair area until the level of sand fills the hole and levels the repair area until level with rest of the floor surface (left). Then saturate the sand with the liquid. Reapply more sand and liquid as needed until the area is built up level to floor (right)
  • Finally, trowel the floor to smooth out the area and remove any excess material. Allow the material to cure for ten to twenty minutes before foot traffic. Immediately after you are through using the liquids from the tube set, remove the static nozzle and place the end caps back on each tube as this will allow the use of the tubes for later repairs. For heavy equipment such as fork trucks, allow the material to cure for a half hour to an hour before using area that has been patched.

INSTALLATION INSTRUCTIONS: NOTE: Reaction with trace amounts of moisture may cause E343 to expand, create a foam and could raise the product as it cures above the substrate’s surface that may require shaving with a stiff metal scraper, floor knife or grinding flush with a flap wheel.

• Product is initially dark gray/black when mixed, but will turn gray upon curing
• Many applications are finished by sanding or grinding the surface smooth
• Always wear proper personal protective equipment, such as safety goggles, dust mask/respirator and gloves while sanding or grinding (see Safety Data Sheet)

• INTERIOR APPLICATIONS: Some color variation may occur during the curing process
• EXTERIOR APPLICATIONS: Product may develop a greenish tint after cure due to UV exposure; Application of a coating, paint or industrial grade primer is an option for improving aesthetic appearance
• Always complete a compatibility test on a small area prior to full application of any coating

1. Prepare crack or spall prior to starting.
2. New concrete should be a minimum of 21 days old.
3. Clean the crack by wire brushing.
4. Blow out with compressed air; repeating until free of dirt and debris deep into the crack.
5. It is not necessary to open or widen a crack unless you suspect it is very deep and want to insert backer rod or kiln-dried sand to control loss of product deep into the crack.

1. A dry diamond blade, tuck point blade or masonry blade may be used to prepare the spall and create a clean bonding surface.
2. A wire brush or twisted wire wheel may be used to remove any loose concrete or dirt.
3. Avoid feathered edges (see Figure 1) which leave the edges of concrete thin and prone to cracking and deterioration.
4. The edges must be ground at a 90° angle to the surface (see Figure 2).
5. Use compressed air or vacuum, blow out or remove all dust, dirt, debris, oil and any other contaminant from the crack.
6. Minimum spall depth across the entire repair area should be 1/2 in. (13 mm) when applying mortar or neat material.
NOTE: No high spots should exist.

1. In horizontal concrete slabs, inject directly into cracks by placing the mixing nozzle tip directly over the crack. Allow adhesive to
penetrate into the crack and top-off as needed. Kiln-dried medium grade silica sand can be broadcast on top of the repair to add
texture or to more closely match that of the existing concrete.
2. For larger, deeper cracks, insert backer rod or a layer of kiln-dried sand to eliminate excessive loss of adhesive. The layer of
product must still be at least 1/2 in. (13 mm) deep on top.
3. The repair will be tack-free in less than 10 minutes at 75 °F (24 °C). Excess material may be removed shortly after application by
scraping/leveling with a blade. The crack surface may be ground smooth one hour after application. See SDS for precautions
while grinding.
4. Allow material to fully cure before subjecting repaired area to any type of traffic (see Table 3 for working and full cure time

1. Spall repairs can be made with neat material or using a repair mortar.
2. To form a repair mortar, NP343 should be mixed with kiln-dried medium grade (approximately 60 mesh) silica sand to form a
repair mortar. Deep patches can use larger aggregate blends.
3. For best results have all equipment and materials prepared prior to mixing. The ratio of sand to mixed adhesive should be
between 1 and 3 parts of sand to 1 part of mixed product. For best results, test several ratios to select the ratio of sand to liquid
to yield desired results. Premeasure the sand needed based on the volume of mixed NP343.
4. 5. After mixing the NP343 at 75 °F (24 °C), it must be placed within 5 minutes. In warmer temperatures, place product in less than
5 minutes.
6. Rapidly pour and trowel (do not over trowel due to fast cure of product).
a) Only mix the quantity that can be mixed/placed within 5 minutes (1 gallon at a time maximum).
b) Repairs should be from a minimum 1/2 in. (13 mm) up to a maximum 3 in. (76 mm) per lift to avoid cracking from high heat
exothermic reaction.

1. Unprotected control joints may spall when subjected to traffic.
2. Saw cut spall areas as described in spall repair preparation section.
3. Fill entire area with the mixed product.
4. After cure, saw cut control joint and fill with a suitable filler.


  • Because of the quick cure time for this product, it is best to work with one small area at a time.
  • Do not thin with solvents, as this will prevent cure
  • NOT intended for aesthetic finishes as product may develop a greenish tint from UV exposure or may cure with an uneven color with swirls or marbling – when cured it can be coated or painted to meet desired appearance
  • This product is highly sensitive to and reactive with moisture and therefore, the cementitious substrate must be completely dry prior to application.
  • Substrate temperature must be 50 F above dew point.
  • All new concrete must be cured for at least 21 days prior to application.
  • Additional care should be taken when injecting into cracks below grade and/or below 32 °F (0 °C). Also, it is best to keep the material and aggregate sand at normal room temperature.
  • Test data based on neat resin unless otherwise noted.
  • Physical properties are typical values and not specifications.
  • See below notice for limitations of our liability and warranty

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.

Dripless DC600 Dual Component Joint Filler Cartridge Gun 300ML x 300ML | Epoxy Polyurea


  • Dual-Component twin cartridge gun
  • Each cartridge holds either 11 oz /300 ml or 5.5 oz / 150 ml of product
  • Handles both 1:1 (300 ml x 300 ml) or 2:1 (300 ml x 150 ml) mix ratio tube configuration
  • Quickly Apply Polyurea, Epoxy, Urethane Products
  • Easy Application Of our Polyurea repair products: 3246, 3004, 800, 830 and the Epoxy/Urethane E443
  • Thrust Ratio 26:1 For Very High Viscosity Materials
  • Each Pull Of Trigger Advances Cartridges By 3.5 mm
  • Dual Steel Gripper Plates And Steel Push Disc Provide Durability
Select options

Newborn 435-XSP Dual Component Cartridge Gun 300ml x 300ml | 300 ml x 150 ml


  • Dual-Component Gun 10.5 oz/300ml Cartridge in 1:1 and 2:1 Ratio 300 ml x 150 ml
  • Easily Converts to 300ml x 150ml cartridges
  • Quickly Apply Polyurea, Epoxy, Urethane Products
  • Easy Application Of Our Twin Cartridge Joint Fillers 3246, 3004, 4034, 830, E5830
  • Thrust Ratio 26:1 For Very High Viscosity Materials
  • Two-piece stamped steel friction plate
  • Heat treated piston rod for increased durability
  • Pressure release thumb plate offers easier pressure release
  • Horizontal cartridge loading
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Newborn 535-XSP Professional Dual Component Cartridge Gun 300ml, 150ml, 75ml


  • Dual-Component Gun 10 oz/300ml Cartridge 1:1 ratio
  • Multi-Ratio Easily Converts with Snap In/Snap Out Push Disks for 300ml, 150ml 75 ml cartridges
  • Quickly Apply Polyurea, Epoxy, Urethane Products
  • Easy Application Of Our Twin Cartridge Polyurea's 3246, 3004, 4034, 830
  • Thrust Ratio 26:1 For Very High Viscosity Materials
  • Extra Durable Teat Treated Piston Rod
  • Precision Sintered Friction Plate
  • Patented Stabilizing Plate for Extra Cartridge Support
  • Easy Release Start Burst Reverse Gripping Plate
  • Hammered Finished Alloy Handle With Comfort Grip
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Newborn 830A30 Pnuematic Dual Component Cartridge Gun 300ml, 150ml, 75ml


  • Dual-Component Pneumatic Gun 10 oz/300ml Cartridges 1:1 ratio
  • 2.5" Cylinder Generates 490 lbs Nominal Thrust @100 psi
  • Quick application with smooth, even product flow
  • Multi-Ratio Convert to 300ml 150ml 75ml cartridges using snap-in disks
  • Quickly Apply Polyurea, Epoxy, Urethane Products
  • Easy Application Of Our Twin 10.5 oz/300 ml Cartridge Joint Fillers 3246, 3004, 4034, 830, E5830
  • Patented stabilizing plate securely holds cartridges
  • Adjustable heavy duty aluminum air regulator
  • Air dump valve stops flow instantly
  • Reverse air
  • Quick disconnect nipple
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