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Watco Concrex Vertical

Permanent repairs to vertical or overhead surfaces

  • Lightweight non-slump formulation
  • Ideal for frost damaged and spalled concrete
  • Durable, impervious finish
  • Strong two-pack epoxy resin mortar
  • Excellent adhesion and durability

Frequently bought together


Watco Concrex® Vertical is a two part epoxy resin mortar with special lightweight fillers and is approximately a third of the density of ordinary mortars. This means it can be used repair damaged concrete pillars, sills, lintels, beams, render and stonework without slumping or falling out as the repair sets. It is ideal for frost spalled concrete surfaces with exposed reinforcement. Apply at any depth without the need to build up layers. Watco Concrex Vertical Cold Cure is ideal for repairing damaged masonry on vertical surfaces in cold rooms or externally.

Recommended areas of use

  • Damaged concrete pillars, sills, beams, render and stone work
  • Frost spalled and damaged concrete surfaces
  • Areas with exposed reinforcement


  • Will not slump during application
  • Will not shatter under impact damage
  • Durable and impervious finish
  • Provides excellent chemical resistance
  • Will hold lightweight fixings while wet or can be drilled after curing
  • Coverage approx. 0.6m² per 2.5kg at 5mm thick
  • Concrex Vertical Cold Set cures in temperatures as low as 0°C
  • Apply at any depth without the need to build up layers
  • Watco Tack Coat is recommended for all applications
Properties Special lightweight fillers, will not slump during application, will not shatter under impact damage, cures fast to a durable and impervious finish.
Suitable for Concrete, sand & cement and metal.
Finish Smooth, impervious surface
Interior or Exterior Interior and exterior
Primer required Not usually – see section overleaf headed ‘Priming’.
Composition Epoxy resin mortar with lightweight fillers
Number of components 2
Coverage 2.4m² at 5mm thick per 10kg
Application tools Steel float or trowel.
Curing time 3-6 hours at 20°C. Protect from rain as far as possible for the duration of the curing period. The cure of Concrex Vertical will be slowed and eventually halted at temperatures of 10°C and below. At these temperatures use Concrex Vertical Cold Set.
Minimum application temperature 10°C
Pot life 30 minutes to 1 hour, depending upon temperature. If Concrex Vertical is used past its working life, trowelling will become difficult and adhesion reduced.
Storage Store for 8 hours prior to use at a temperature of between 15°C and 25°C maximum. Do not allow to freeze.
Shelf life 12 months in unopened container.
Depth (mm) There is no limit to the depth of the repair. (full strength is achieved at 5mm).
Principle limitations Concrex Vertical has excellent adhesion, chemical and weather resistance but due to the lightweight fillers used it will not have the same resistance to impact damage as Watco Concrex. Concrex Vertical however, will not shatter like concrete under impact. Concrex Vertical may not be impervious at thickness less than 5mm. Concrex Vertical is not suitable for structural or bonding applications and is intended for surface facing and filling only.
Cleaning When fully cured, detergents or degreasants may be used to clean the surface. Do not steam clean or subject to temperatures of excess of 60°C
Cleaning tools Clean with white spirit or similar before Concrex Vertical Cures

Surface preparation

Surfaces should be clean, dry and free of all loose material. Wire brushing or sweeping is generally suffcient. 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 is recommended when applying Concrex as a thin section screed or when applying to smooth, non-porous or metal surfaces. Watco Tack Coat enables repairs to be made to damp areas. Watco Tack Coat is required before making repairs to vertical masonry with Concrex Vertical.


Each pack of Concrex contains aggregate pre-blended with resin and the curing agent. If the entire pack of Concrex 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 bottle or tin. Do not mix inside the plastic bucket. Wearing protective gloves, tip the aggregate on to 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 drained. 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.


If appearance is critical we recommend the application of a small trial area first. 
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 is normally applied in thicknesses of 5-50mm, but repairs can be feather-edged for a neat finish, as long as the majority of the 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 in layers.

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£100.80 (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)

Concrex Mixing Tub

Concrex Mixing Tub

Ideal for mixing Watco Concrex

£11.20  (Ex VAT)

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