LCR FAQ's - Frequently Asked Questions

What is LCR?
LCR is LIQUID CONCRETE REPAIR which is a two-component, 100% solids epoxy resin repair system packaged in a single-use 10 ounce cartridge that is easily dispensed with any ordinary caulking gun!

What is Epoxy?
Epoxies are basically high-strength plastics. There are literally thousands of formulations used for everything from artificial trees in a zoo to gluing heat shields on the space shuttle. Epoxies consist of a resin and a hardener which when mixed together causes the two materials to react and harden.

What are some of the uses for LCR?
Typical uses are repair of cracked concrete such as floors, driveways, and pavements. Cracked and leaking foundations. Restoration and bonding of wood, fiberglass, metal, and masonry materials. Anchoring and securing of railings, posts, and fasteners. LCR can be used to stop water, air, and radon seepage.

How long will an LCR repair last?
Permanently! Used properly, an LCR repair can be a permanent repair, which will meet or even exceed the original life expectancy of the item repaired.

What color is LCR?
LCR is clear with a slight amber tint. An LCR repair will have a ‘wet’ look much like a varnish. Sprinkling a ‘like’ material such as sand on concrete or saw dust on wood to the uncured LCR can provide a more finished look.

Can I sand or paint LCR?
Yes.

How fast does LCR harden?
Once properly mixed, LCR has a working time of 30 minutes, will harden in 6-8 hours and achieve full bond strength in 24 hours.

What will LCR not repair?
Glass, plastic and smooth or polished surfaces. LCR should not be used in expansion joints or during cold weather or when surface moisture is present.

Is LCR harmful or dangerous?
LCR is 100% non-toxic in a cured form and is completely safe when used in accordance with the manufacturer’s printed instructions.

How is LCR so much better than other materials?
Products such as caulks, sealers patches and adhesives are temporary repairs which require re-application over a period of time. LCR is specifically designed to provide for a PERMANENT repair which meets or exceeds the original strength of the item repaired. LCR is so strong it can withstand pressures of over 14,000 pounds per square inch! LCR is a very low cost alternative to the expense of replacing a driveway, sidewalk, pool, etc.

LCR - LIQUID CONCRETE REPAIR
For cracked and leaky foundation repair

What is the LCR Kit?
The LCR Kit is an easy-to-use, complete repair system for cracked and leaky foundations specifically designed for DYI and contractor use. It comes with a crack sealer, injection ports, and two ten-ounce LCR injection cartridges, which is enough to repair an average 8-foot foundation crack.

How is the LCR kit different from other crack repair materials?
Other crack repair products such as hydraulic cement, tars, latex coatings and caulks are all temporary ‘Band Aid’ repairs that are surface applied and rely on a surface bond to work. Moisture in the crack will ultimately break down this bond, and the repair will fail. Even chipping out the crack and patching with hydraulic cement gives a nominal repair which will re-crack and fail if the foundation shifts. Other repair products cannot withstand the movement in foundations caused by soil pressures and seasonal thermal changes. The LCR Kit will fill the entire crack with high-strength epoxy resin that permanently bonds the crack and is flexible enough to withstand movement in the foundation. Filling the crack with epoxy is the only way to ensure that water will not penetrate into the crack.

What other tools do I need?
A standard caulking gun for dispensing the injection liquid and a spatula for mixing the crack sealer.

Can I repair a crack that is actively leaking?
No. (See POLYFOAM) LCR works best when installed under dry conditions and will permanently prevent further seepage from the crack.

Can the crack sealer be applied to damp concrete?
Yes. Again, every attempt should be made to install the LCR system under dry conditions; but when working under damp conditions, a longer set time for the crack sealer to gain bond strength should be allowed prior to injecting the LCR injection resin. Fans or a portable hair dryer can be used to help dry the crack surface prior to application of the crack sealer.

Can I remove the injection ports after the completed repair?
Yes, but first wait 24 hours to allow the LCR injection resin to harden and fully cure. A hammer and chisel will easily remove the injection ports, and the crack sealer can be sanded, ground off or painted.

DOs and DON’Ts

  • DO read the instructions and thoroughly mix the materials.
  • DON’T rush! Let the crack sealer harden before injecting.
  • DO properly prepare the surface.
  • DON’T apply crack sealer to dusty, wet or dirty surfaces.
  • DO inject the entire crack.
  • DON’T force the injection resin to prevent blow backs.