For the best possible results, use Westox quality products!



Waterproofing CR25


Heritage Restoration
Architectural Coatings



WB Silane
WB30 Epoxy
WB25 Epoxy
Wet Area Membrane
Salt Retarder



A one component latex based emulsion and when mixed with fine cement provides a semi-rigid waterproof coating, used as a primer / coating system.


As a tanking membrane for internal and external walls.  To provide a sealed surface on concrete substrates under sheet membranes or as an adhesive between layers of concrete.  When mixed with fine cement Westox CR25 acts as a waterproof coating on solid substrates.  Westox CR25 will bond normal render to high strength concrete and eliminate render slide during application over non-porous surfaces.


  • Unaffected by water after final set.
  • Can be applied to damp surfaces.
  • Is easily repaired. 
  • Can be rendered or painted over.
  • Excellent adhesion.
  • Increased bond strength.


 Specific Gravity  1.0
 Vapour Transmission  0.002g / m2 / 24 hours - 92% RH
 pH  10.5 - 11.5
 Hydrostatic Pressure  Will work to 25m head of water


  • Do not apply coating if temperature is below 10°c or above 35°c.
  • Do not apply coating if rain is imminent.

Sound coatings may be overcoated.
The surface to be treated should be clean and sound, free of oil, grease and flaking paint, laitance and material deleterious to the adhesion of the coating system.


Pour Westox CR25 into mixing vessel, then slowly add ordinary Portland cement (type GP) whilst consistently mixing, to produce a lump free consistency.  If in doubt, sieve cement first.
Mixing ratio one (1) part Westox CR25 to two (2) parts cement by volume.
Yield 5 Litre Westox CR25 and 10 Litre cement – 12.5m2 @ 1mm thick.
Application by brush or broom for primer and finishing coats.

Apply first coat of Westox CR25 to pre-moistened surface to the recommended thickness of 1mm, brushing in one direction only.  (This one application is sufficient when using as a render adhesive.  Apply render while Westox CR25 / cement is still wet or green.)
(Do not use type GB or Builders Cement).

  • Do not brush out too thinly. (maximum of 1mm per coat)
  • Do not use coating as a filler.
  • Do not spray (this product is not suitable for spraying).

The second coat may be applied as soon as the first coat has set.  Brush or broom at right angles to the previous application to ensure no pinholing occurs.  Apply at the same thickness as first coat.  For tanking procedures when rendering over the Westox CR25 and cement, allow first two (2) coats to dry for 24 hours then apply third as for render adhesive.

Allow at least 16 hours before putting into service or painting.


Wash all equipment with fresh water immediately after use and before Westox CR25 has set.


Container Size - 5 Litre and 20 Litre containers.


Avoid repeated and prolonged skin contact with Westox CR25.

Refer to Westlegate Pty Ltd Material Safety Data Sheet (MSDS) for instructions


The information contained on this site is intended to give a fair description of the products and their capabilities under specific test

conditions.It does not constitute an offer by the manufacturer, nor does the manufacturer warrant or guarantee its accuracy or

completeness in describing the performance or suitability of the various products !


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