Sherwin-Williams Floorcoating Cemcrete Primer 4.7 Kilograms

  • Single Pack
  • Easy to Use & Apply
  • Bonds to Cementitious Substrates
  • Can be Used as a Dust Sealer
  • Water & Alkali Resistant

Sale price£30.00ex vat

Cemprime is a single pack copolymer emulsion designed purposely as a primer for porous substrates. It stabilises and seals substrates effectively promoting adhesion that will allow self-smoothing compounds to be applied directly. It can also be used as a dustproof coating when applied as a tight coat by squeegee or roller depending on texture, and finish. Once dry R.S. Cemprime produces a water and alkali resistant polymer layer which both bonds to and strengthens the surface.


• Single pack
• Easy to use and apply
• Provides effective bonding to cementitious substrates
• Can be used as a dust sealer
• Water and alkali resistant

Recommended Uses

• As a primer for pumped industrial screeds
• Ideal for porous substrates such as concrete and sand/cement
• As a temporary surface sealer and dust proofer


New Concrete Floors:

New concrete must be clean, sound, dry, fully cured and surface laitance removed by vacuum enclosed shot blasting or mechanical grinding, a minimum strength of 25N/mm2 is required.

Existing Concrete Floors:

Remove all dirt, oil, grease, old paint or any other surface contaminants by vacuum enclosed shot blasting, scarifying or mechanical grinding. Fats, oils or greases must be removed by mechanical means and detergent washing and make sure all residue of detergent is washed and removed by rinsing with clean water. Local repairs should be carried out using Resupatch or Resuscreed 45.

Existing Floors (previously coated):

All previous coatings and loose floor paints must be removed by mechanical preparation as described in the above section and primed as specified. if the old resin flooring cannot be removed, then please consult with our technical team for advice on intercoat adhesion and suitability, as it may not be compatible with existing floor coating.

Where R.S. Cemprime is applied to masonry/concrete surfaces, care must be taken to ensure that surface preparation is thorough but does not disfigure the surface.


The ambient temperatures of the area and substrate should not be allowed to fall below 10oC throughout the application and the curing period. Where possible it is recommended that the
the application area is <75%RH, heated to a minimum temperature of 15oC and time is allowed for the ambient and substrate temperature to stabilise prior to installation.
R.S. Cemprime can be applied by squeegee, brush or roller and worked well into the surface, at a rate of 5 m2 /l. Open, highly porous substrates may require a second application to ensure the formation of a suitable surface film to provide a bond. Rates of coverage may vary substantially dependant on the surface preparation and finish of the concrete, rates given assume a shot blasted surface with medium porosity. Once applied and dry it will
not re-disperse in water.
On highly porous surfaces, or when used as a dust proofer, a very dilute (1:1 with water) wash may be applied to obtain maximum penetration Once dry this should then be followed by an application of the standard material (neat) to the surface to build the film thickness.
N.B. R.S. Cemprime is not suitable for non-porous surfaces.

Full product data sheets and safety data sheets are available on request.

Download Safety Data Sheet (SDS_SW_Cemcrete_SM.pdf)

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