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Watco Concrex Flex

Impact and crack resistant floor repairs

  • Virtually indestructible epoxy resin repairs
  • Exceptional impact and wear resistance
  • Chemical resistant and anti slip
  • Can be feather edged
  • Resistant to vibration

Frequently bought together


Watco Concrex® Flex has been specially developed with a new blend of resins, to enable expansion joints, ramps, guide rail surrounds 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. Watco Concrex Flex also has excellent chemical resistance and cures quickly allowing the floor to be put back into use.

Recommended areas of use

  • For floors subject to vibration, movement or impact


  • 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
  • Exceptional impact and wear resistance
  • Use internally or externally - it will not be damaged by frost
Suitable for Concrete, sand & cement and metal.
Appearance Mid Grey.
Interior or Exterior Interior and exterior.
Primer required A primer is not usually required if patch or crack repairing. Watco Tack Coat adhesive primer is recommended when applying Watco Concrex® Flex as a thin section screed or when applying to smooth, non-porous or metal surfaces. Watco Tack Coat also enables repairs to be made to damp surfaces.
Composition A finely graded sand pre-blended with epoxy resin.
Coverage 1.2m² at 5mm thick per 10kg
Application tools Steel float or trowel.
Curing time Normally 3-6 hours depending on temperature. Curing times will be extended by low temperatures. Curing times will be very slow or even arrested by temperatures at 10°C and below.
Minimum application temperature 10°C
Pot life 30 minutes to one hour, depending on the temperature. If Concrex Flex® is used past its working life, trowelling will become difficult and adhesion will be reduce.
Storage Store at a temperature between 10°C and 30°C. Do not allow to freeze.
Depth (mm) Up to 50mm for hole filling only. Do not use at more than 15mm for screeding.
Principle limitations Do not apply to wet surfaces. Watco Tack Coat should be used for application to damp surfaces before applying Concrex Flex.
Cleaning tools Equipment used for mixing and applying should be wiped clean with white spirit or a similar solvent before the Concrex Flex cures.

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. If the surface is damp it can be primed with Watco Tack Coat.


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. A 'Creteangle' or similar mixer can be used to ensure thorough mixing of larger quantities.


Watco Concrex Flex® is trowelled firmly against the surface to be repaired, and finished with a trowel or float. To prevent drag on the trowel, a rag moistened with white spirit may be wiped across the face of the tool.

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£104.00 (Ex VAT)

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Tools and accessories

Trowels and Floats

Trowels and Floats

Ideal for mixing, applying and levelling repairs

From £3.60  (Ex VAT)

Watco Concrex Application Kit

Watco Concrex Application Kit

Everything you need for applying Concrex

From £16.00  (Ex VAT)

Watco Tack Coat

Watco Tack Coat

High strength 100% solids epoxy resin adhesive primer

From £24.80  (Ex VAT)

Wire Brush & Scraper

Wire Brush & Scraper

A useful tool for removing rust and old coatings

£2.70  (Ex VAT)

Watco Low Odour White Spirit

Watco Low Odour White Spirit

Ideal for cleaning tools after application

£5.30  (Ex VAT)

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