Centrecoat R28 Pure Sealer

Non Hazardous
A penetrating silane siloxane sealer for porous building materials giving extended protection against water penetration.
Available in 5 Litres in Clear
From £38.23 £31.86
In stock
Only %1 left
Product Description

Centrecoat R28 Pure Sealer is a silane siloxane penetrating sealer for porous building materials, giving extended protection against water penetration.

Best Uses

Centrecoat R28 Pure Sealer is suitable for application onto brick, concrete, glass-fibre, reinforced concrete, natural stone and mortar. Provides excellent protection against both water and moisture penetration, plus fuel and oil spillages. This product is similar to the now discontinued Liquid Plastics (Sika) K501.

  • Reduces the likelihood of algae growth
  • A treated surface remains breathable, enabling residual moisture to escape as vapour
  • Ideal treatment for the underside of floor tiles before installation, preventing ingress of moisture from underneath
  • UV resistant
  • Not suitable for non-porous surfaces such as engineering brick, polished & glazed tiles


Care required where water repellent additives are sometimes used in concretes containing hydrophobic silica or stearate. Perform a simple test to apply the product and if it immediately penetrates and darkens the surface then the treatment is perfectly suitable. If, however, the treatment beads and doesn’t penetrate, then the surface needs a clean to remove the surface additives.

Ensure the surface to be treated is clean and free of all dust, soiling, organic growth and salt deposits. Surface and air temperature need to be >10°C. Do not apply externally during damp and wet weather or if rain is imminent, and avoid applying to hot surfaces >40°C or in strong, direct sunlight.

Shake the container well before opening. Ensure the surface is visibly dry before application. Always carry out a test on an agreed trial area to ensure Centrecoat R28 Pure Sealer is both suitable & delivers the required performance. Two applications are required, the second being within 2 hours of the first. Splashing product onto adjacent surfaces should be wiped off immediately with a soft, dry cloth.

Allow a minimum of 2 hours following application before foot traffic is allowed, and at least 36 hours for heavy traffic. After 2-3 days the treated surface will achieve its optimum performance, although in cold weather this will up to 7 days.

Technical Details


  • Solvent and silicone-free
  • Non-hazardous and safe to use
  • Water borne product
  • UV resistant

Technical Info

Components: Single Pack
Type: Aqueous silane-siloxane dispersion
Finish: Invisible Once Dry
Stock Colours: Pale Straw (Invisible Once Dry)
Tintable: No
VOC Content: 0 g/L
Volume Solids:
Suitable Substrates: Suitable for application onto brick, concrete, glass-fibre, reinforced concrete, natural stone and mortar
Application Method: Brush, Roller
Theoretical Coverage: 4-6 m² per Litre.
Coverage depends on the porosity of the substrate. The above values are given only as an indication.
Wet Film Thickness (WFT):
Dry Film Thickness (DFT):
Induction Time: -
Pot Life: -
Foot Traffic Ready: 2 hours at 20°C
Heavy Traffic Ready: 36 hours at 20°C
Fully Cured: 2-3 days at 20°C, in cold weather up to 7 days
Cleaner / Thinner: Clean tools and equipment immediately after use with water.
Shelf Life: 24 months from the production batch date when kept in the original unopened container.
Packaging: Available in 5 Litres

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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