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Concrex Flex

A flexible, heavy duty repair to areas subject to movement and vibration. Ideal for expansion joints, ramps, guide rails or drains. This flexible repair mortar can be feather-edged and will not break.



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Fast Facts

Suitable For Repairing damaged concrete around expansion joints, ramps and machinery
Coverage 10 sq ft per 22 lb kit at 1/4" thick

Product Details remove

Watco Concrex Flex has been specially developed with a new blend of resins, to enable expansion joints, ramps, guide rail surroundings and any other areas commonly subject to vibration and movement to be repaired. Areas like these may have been badly affected by cracking and spalling in the past, but Watco Concrex Flex will provide a permanent repair where a rigid mortar might fail.

  • Flexible and tough
  • Resistant to vibration
  • May be feather edged
  • Fast curing
  • Chemical resistant and anti-slip
  • Impermeable and non-dusting
  • Can be painted if required
  • It has all the strength and abrasion resistance associated with Concrex original but offers sufficient flexibility to resist cracking due to movement of the substrate

    Watco Concrex Flex cures in 6 hours depending on temperature. Curing time will be extended by low temperatures. Curing will be very slow or even arrested by temperatures at 50°F and below.

    Coverage: approx. 10 sq ft per 22lb kit at 1/4" thick.

Application Video



Pendulum Slip Test Values
Dry PTV Wet PTV
 70 Extremely low slip potential 

 62 Low slip potential

Specifications add

Primer Required Tack Coat adhesive primer is recommended when applying Watco Concrex Flexible as a thin section screed or when applying to smooth, non-porous or metal surfaces
Usage Interior / Exterior Interior & Exterior
Suitable For Repairing damaged concrete around expansion joints, ramps and machinery
Surfaces Concrete, sand, metal and cement
Max Operational Temperature (°F) 70°F
Coverage 10 sq ft per 22 lb kit at 1/4" thick
Curing Time (hours) 5-6 hours at 60-70°F, ready for heavy traffic in 8-12 hours
Pot Life Half to one hour depending on the temperature. If Concrex Flexible is used past its working life, trowelling will become difficult and adhesion will be reduced

How to Apply add

Surface Preparation
Surfaces should be clean, dry and free of all loose material. Wire brushing or sweeping is generally sufficient. Watco Bio-D degreaser can be used to remove grease and oil.

Mixing and Application
Each Watco Concrex Flex® pack contains a granular resinous compound and separate containers of curing agent. The components are mixed by trowel according to the simple instructions in the pack until a smooth grey mortar is obtained. The more thorough the mixing, the ‘wetter’, smoother and more manageable the mix becomes. This can be achieved quite quickly by wearing disposable gloves and kneading the mixture by hand.

This is troweled firmly against the surface to be repaired, and finished with a trowel or float. To prevent drag on the trowel, a rag moistened with mineral spirits may be wiped across the face of the tool.

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