SHIPPING DELAYS: There are ongoing issues moving product both locally, around the USA, and the globe, it is essential that you take this into account when ordering materials, tools or product over the next 3 to 6 months, especially if you run on a "just-in-time" basis. There are still shipping delays for some products in the supply chain for critical construction products. Please make sure to order items well in advance to make sure your order arrives in time for your next job. Most manufactures have already implemented “force majeure” and placed additional surcharges and fees to secure their raw materials. Conspec is filling online orders as soon as possible, however with the supply chain broken, and only receiving partial inventory from manufactures with increased demands the shortages are out of our control. We apologize for the inconvenience and thank you for your patience in these challenging times.
Sale! ATC Concrete Repair Crack-KIT 2021 Conspec
ATC Adhesives Technology Crack-Kit LR-321 Liquid EpoxyATC Adhesives Technology Crack-Kit LR-321 Static Mixer NozzleATC Adhesives Technology Crack-Kit Miraclebond Capping PasteATC Adhesives Technology Crack-Kit Concrete Repair Epoxy applicationATC Epoxy Injection Concrete Crack portsATC Crackbond Epoxy Surface Mount Epoxy Injection Port CR Port SS


Conspec Family Business BadgeConspec Warranty BadgeTwo part, 100% solids, high strength epoxy repair adhesives for repairing cracks in concrete.


Out of stock

ATC Epoxy – “Crack-Kit” Concrete Crack Repair Kit

The Concrete Crack Kit from ATC has everything you need to perform low pressure crack injection and concrete repair at an affordable price.  The injection epoxy is formulated to repair cracks in wood & concrete structures that are hairline to medium sized in width from 1/400″ to 1/4″ wide in concrete walls, floors, slabs, columns and beams. The LR321 epoxy has the viscosity of light oil and a very low surface tension, allowing it to penetrate fine to medium-width cracks in dry, damp or wet conditions.  Patented Crack Ports virtually eliminate under-filling the crack with their check valve ball bearing that prevent backflow, even after the resin is dispensed into the port.   This epoxy formulation is identical to their popular, high strength DOT epoxy adhesives but packaged in smaller easy to use cartridges.  Cures to a solid state, no shrinkage, PSI ratings are an average of five times stronger than concrete!  Convenient easy to use, single tube cartridge – fits standard caulk guns.  The low viscosity LR321 deep penetrating epoxy is similar to a light oil, and exhibits tenacious bonding in structural concrete cracks.  The Thick Gel paste Miraclebond epoxy included can be used as a capping paste, or to repair larger cracks in concrete and wood.

Contains everything needed to structurally repair 8-10 feet of crack

Click here to buy additional > SURFACE PORTS

Click here to buy additional > HOSE TUBE ASSEMBLY for attaching to the ports.

Click here to buy additional  > LR-321 EPOXY

Click here to buy additional  > MIRACLEBOND EPOXY

Meets Florida DOT Approved Products List 

Florida DOT Approved Products List APL QPL Materials   CLICK HERE for FL-DOT APL Listing for Crackbond LR-321 Injection Resin 

Multiple Uses:

  • Low Pressure Crack injection
    • Concrete crack and spall repair
    • Bonding agent for concrete, brick, stone, tile, steel, and wood
    • Patching Material
    • Primer for industrial coatings
    • Crack Healer & Sealer
    • Epoxy Grouting of bolts, dowels, pins, etc. into horizontal concrete surfaces
    • Gravity fed structural crack repair
    • Becomes a Mortar when mixed with sand
    • Capping paste sealer Miraclebond included
    • Fix larger vee-notched or hairline cracks
    • Repair Rotted wood
    • Fix Loose railing
    • Fix Broken steps
    • Fix Broken Concrete


  • Easy to mix, Easy to use, conveniently packaged in standard caulking tube sizes
    • Chemically bonds with the concrete to restore strength Bond
    • Once cured, this Non-shrink material is resistant to water, salts, oils, & mild chemicals
    • Forms a permanent polymeric bond that will not re-emulsify
    • Seals out water, chlorides, salt, protects rebar in the concrete from corrosion
    • Low viscosity epoxy penetrates fine to medium-width cracks in dry, damp or wet conditions
    • Cures to a solid state, no shrinkage, returns structure to its monolithic strength
    • Low cost method to structurally re-bonding cracked concrete and wood members
    • Superior physical properties, capable of restoring a cracked structure to its original state.

Kit Includes:

  • 3ea. cartridges of LR-321 Injection Resin Epoxy
    • 3ea. cartridges of Miracle Bond Paste Epoxy
    • 12ea. Crack Injection Ports
    • 1 Plastic Putty Knife
    • 3ea. T58CBS Nozzles
    • 3 ea. Flow Restrictors
    • 2 Wood Depressors
    • 1 Pair Latex Gloves
    • 4 Mixing Cups

Click here to buy additional > SURFACE PORTS

Click here to buy additional > HOSE TUBE ASSEMBLY for attaching to the ports.

Click here to buy additional cartridges of > LR-321 EPOXY or Click here to buy additional  > MIRACLEBOND EPOXY

Weight 192 oz
Dimensions 12 x 12 x 10 in
Product Size


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