ElastiPoxy™ Joint Filler Application

Surface Preparation

Concrete surface must be clean – remove any dirt, paint, oil, efflorescence, or bond-inhibiting contaminants. Vaccum dust.

Surface may be slightly damp but a dry surface is preferred for best results. Surface temperature must be above 40 °F during the application and for 24 hours after.

Crack Preparation

ElastiPoxy repair of wide cracks or control joints in concrete floors
Narrow Cracks:
The crack or joint should be at least 1/4” wide. Route out cracks in floors or walls with a hand-held angle grinder or hammer chisel at least 1/2” deep. Remove loose concrete and dust (air blower, shop vac).
Containing the Epoxy:
To prevent the epoxy from running out of the bottom of wider cracks or joints, insert a foam backer rod of suitable diameter (sold in stores), or fill partially with sand or caulk up to 3/4” to 1/2” below the surface. This will also serve as a bond breaker to prevent the filler from adhering to the bottom of the joint.
Larger Joints or Cracks:
Fill the crack partially with a foam backer rod or sand to prevent the epoxy from bonding to the bottom. The depth of the remaining void should not exceed its width.
Leaky Tie Rods:
Chisel out the concrete at least ½” deep. Remove loose concrete and dust.

Bond breaker - Make sure that the jont filler does not bond to the bottom of the control joint or crack use a foam backer rod or pour in some sand! Example: If the filler adheres to the bottom of the joint and the crack in the bottom is 1/8" wide, a 1/8" movement of the concrete would require a 100% elongation of the epoxy spanning the crack. This exceeds the limits of elastic epoxies and the joint filler would crack.

Mixing Procedure

Mix Compounds A and B separately in their own containers using the two mixer attachments in a slow-speed electric drill – do not cross contaminate! Using the measuring cups, pour equal amounts of Compounds A and B into the mixing container.

Exact measurement is important! Mix together for at least 2 minutes using one of the mixer attachments. If desired, add color pigment while mixing.

If needed, add DRY SAND (play sand or construction without fines) with a measuring cup - at the appropriate ratio - and mix thoroughly.

NOTE: More sand provides a stiffer mixture for vertical surfaces, more volume, but a rigid rather than flexible repair.

After mixing, let the epoxy mixture off-gas for 15 minutes. It has a short pot life – 30 to 45 minutes. Mix only as much product as you can easily apply within 30 minutes.


repair floor-to-wall joint with ElastiPoxy Crack Filler

First, tack-coat the joint, routed crack, or surface with pure epoxy (without sand) using a paint brush. Secondly, pour in the pure epoxy or apply the sand-epoxy mix as described below:

    The pure ElastiPoxy™ is self-leveling. Pour the epoxy into the joint with a plastic cup or small watering can until level.
    Use 2:1 or 3:1 sand to epoxy ratio. Apply with a trowel and smooth out.
  • TIP: Broadcast sand over the epoxy before it cures to add texture and prevent tracking. Lay strips of masonite or plywood over the area if immediate traffic use is required.
    Use a 5:1 or 6:1 sand-to-epoxy ratio and force the mix into the crack with a trowel, starting at the bottom. If the epoxy sags, mix in more sand.
    Use 2:1 or 3:1 sand to epoxy ratio. Apply with a trowel, pushing hard to fill the pores.


Based on a routed out crack 1/4” wide by 1/2” deep and using pure epoxy (without sand), the 2-quarts ElastiEpoxy Kit will fill approximately 75 ft. of cracks and the 2-gallon ElastiPoxy Kit approximately 300 ft.

At a 4:1 sand-to-epoxy ratio, the 2-quarts ElastiEpoxy Kit will fill about 375 ft. of cracks 1/4” wide and 1/2” deep.

Curing Time

cracks in pool deck  before repair with ElastiPoxy

How to repair gouges, spalls, chipped edges, control joints, and cracks in a pool deck while matching the surface color and texture (feedback from a homeowner in PDF).

Depends greatly on temperature:

80°F and higher 45 minutes – 1.5 hours
65°F to 79°F 1 hour – 3 hours
50°F to 64°F 3 hours – 4 hours
49°F and below 4 hours – 8 hours


Clean with water while still wet after installation.
(If cured, clean using xylene or aromatic solvent.)

Shel Life/Storage

Unopened containers – 1 year. Store in a cool dry location out of direct sunlight.


Always use proper industrial hygiene procedures. Refer to Material Safety Data Sheet for further details.
Eye Protection: Safety glasses.
Ventilation:  General vapors may irritate eyes, nose and throat. Ventilate the area adequately.
Clothing: Gloves and boots recommended.
Keep out of reach of children!


We shall not be liable for any injury, loss, direct, indirect, or consequential damages arising out of the use of this product. The buyer shall determine the suitability of the product for the intended use and assumes all risk and liability whatsoever in connection with the use of this product.

Picture Guides for ElastiPoxy Application

pouring epoxy into floor cracks troweling epoxy-sand mix
Repairing Cracks in Concrete Driveways Repairing Cracks in Concrete Block Walls