CR 25
High Strength Rubberised Cement Coating


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. It is recommended that a coating is applied over the top to protect from UV, if required.


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


Specific Gravity at 25°c 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.


The surface to be treated should be clean and sound, free of oil, grease, laitance or any material deleterious to the adhesion of
the coating system. Must be applied direct to masonry substrate.
Do not apply coating if temperature is below 10°c or above 35°c.
Do not apply coating if rain is imminent.


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 that has a high slag content.
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 pin holing 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 7 days before
putting into service or painting.


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


5 Litre, 20 Litre.


6 months.


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