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Watco Concrex Acid Strength

Permanent floor repairs with excellent chemical resistance

  • Epoxy formula - resists 95% sulphuric acid
  • Virtually indestructible and non-dusting
  • Repairs can be feather edged
  • Ready in six hours
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Permanent repairs for acid damaged concrete floors. Concrex® Acid Strength has been developed to give outstanding chemical resistance, even against 95% sulphuric acid. It offers all the strength, ease of use and durability of Concrex® but is ideal for areas where strong chemicals are used or stored. For a full list of chemical resistance, please contact our sales team for more information. 

Recommended areas of use

  • Ideal for areas where strong chemicals are used or stored
  • Suitable on floors, ramps and steps


  • Chemical resistance: will resist even 95% sulphuric acid
  • Has the same strength properties as Concrex® Original
  • Easy to apply: only 2 components mean that it is quick and easy to mix and use
  • Curing Time: light traffic in 8 hours at 15°C, 6 hours at 20°C and heavy traffic in at least 16 hours at 15-20°C. Full chemical resistance reached in 7 days


Properties Incredibly chemical resistant, very tough, granite-hard finish, anti-slip, priming not normally required, impervious and non-dusting, may be feather-edged, cures in 3-6 hours at ambient temperatures, ready for heavy traffic in 8-12 hours.
Suitable for Concrete, metal, brick, masonry
Surfaces Floors, ramps, steps.
Interior or Exterior Interior and exterior
Composition 2 part epoxy resin
Coverage 1.2m² at 5mm thick per 10kg
Drying time 30-60 minutes depending on temperature. If Concrex Acid Strength is used past its working life, trowelling will become difficult and adhesion will be reduced.
Curing time 5-6 hours at 20°C
Minimum application temperature 10°c
Maximum operational temperature 60°C.


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.


A primer is not usually required if patch or crack repairing. Watco Tack Coat adhesive primer is recommended when applying Concrex Acid Strength as a thin section screed or when applying to smooth, non-porous or metal surfaces.


Each pack of Concrex Acid Strength contains aggregate pre-blended with resin and the curing agent. If the entire pack of Concrex Acid Strength cannot be used within 30-60 minutes, the products can be part mixed. 

To split a pack, carefully halve the aggregate/resin mix (ideally divide it by weight) and use half the number of curing agent bottles or tins. Do not split the contents of a curing agent or tin. Do not mix inside the plastic bucket. Wear protective gloves.

Tip the aggregate onto a mixing tray or board. Shake the bottles or tins of curing agent thoroughly until the liquid is a uniform colour. Form the aggregate into a mound and leave a small hole in the middle. Empty the curing agent into the hole, ensuring the bottles or tins are completely empty.

Carefully mix the aggregate with the curing agent using a trowel until a smooth mortar is obtained, this will take several minutes. The more thorough the mixing, the 'wetter', smoother and more manageable the mix becomes. Alternatively, you can knead the mixture by hand, but you must wear suitable gloves. It is important to mix thoroughly until you achieve a consistent colour. Machinery such as a 'Creteangle' mixer or suitable open pan mixer can be used to ensure thorough mixing of large quantities. Once mixed, the product is trowelled firmly against the surface to be repaired and finished with a steel trowel or float.


Trowel firmly against the surface to be repaired, and finish with a trowel or float. To prevent 'drag' on the trowel, moisten a rag with white spirit and wipe it across the blade, which will allow you to create a smooth finish. Concrex Acid Strength is normally applied in thicknesses of 5-50mm, but repairs can be feather-edged for a neat finish, as long as the majority of repair is at least 5mm thick. For repairs deeper than 50mm, apply in separate layers (allow 6-8 hours between layers for curing) or use Watco Concrex Deep Fill (which can be applied 15-100mm thick in one layer). There is no need to reapply Watco Tack Coat if building up layers.


Food products must be removed from the area during application and cure. 



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€142.21 (Ex VAT)

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Tools and accessories

Watco Concrex Application Kit

Watco Concrex Application Kit

Everything you need for applying Concrex

From €18.11  (Ex VAT)

Watco Tack Coat

Watco Tack Coat

High strength 100% solids epoxy resin adhesive primer

From €28.26  (Ex VAT)

Trowels and Floats

Trowels and Floats

Ideal for mixing, applying and levelling repairs

From €4.04  (Ex VAT)

Watco Bio D

Watco Bio D

A heavy duty biodegradable cleaner for floor preparation

From €25.15  (Ex VAT)

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Watco Concrex Acid Strength

Watco Concrex Acid Strength

Permanent floor repairs with excellent chemical resistance

€142.21  (Ex VAT)