Fosroc Renderoc Primer

Non Hazardous
A 2 pack high performance Polymer / Cement Slurry Bonding agent.
Available in 5 Kg
From £28.80 £24.00
In stock
Only %1 left
Product Description

Fosroc Renderoc Primer is a high performance Polymer / Cement Slurry Bonding agent. The primer facilitates bond strengths conforming to the classification of the repair material being used (BS EN 1504-3, class R2, R3, R4).

Best Uses

Fosroc Renderoc Primer is a two component cementitious slurry material comprising specially selected cementitious powders and liquid polymer additives. The mixed slurry is applied to properly prepared concreted, the specified Renderoc repair material is then compacted onto the primer whilst this is still wet.


  • Easy to use
  • High bond Adhesion strength achieved conforms strength to the requirement of BS EN 1504-3,class R2, R3, R4, when used with the relevant Fosroc repair materials
  • Cost effective Economical in use


Prepare concrete substrates in accordance with the instructions of the chosen Renderoc repair material data sheet. The concrete substrate should be saturated surface dry immediately before the application of the primer i.e. it should be thoroughly saturated with clean water and any residual surface water removed prior to applying Renderoc Primer. Under severe drying conditions repeated soaking may be necessary to ensure the substrate is still saturated at the time of application of the primer.

Add 3 parts by volume of Renderoc Primer Part A to 1 part by volume Renderoc Primer Part B (4 to 1 by weight) in a clean mixing vessel and mix with a spatula or slow speed drill until a homogeneous smooth slurry is produced. Scrub Renderoc Primer slurry into the surface. The Renderoc repair material being used can be applied immediately to the primed surface. If the primer dries apply another coat of primer before continuing.

Technical Details


  • London Underground Approved: LUL APR No. 1881
  • Renderoc Primer complies with LU Standard 1-085 ‘Fire Safety Performance of Materials’
  • Facilitates bond strengths conforming to the classification of the repair material being used (BS EN 1504-3, class R2, R3, R4).

Technical Info

Components: Two Components
Type: Acrylic Primer
Stock Colours: Milky appearance
Tintable: No
Application Method: Scrub Renderoc Primer slurry into the surface.
Theoretical Coverage: Approx. 13 litres - 2m2/litre
Cleaner / Thinner: Wash all equipment with clean water immediately after use.
Shelf Life: 12 months if stored in dry conditions. Protect from frost. Open bags of Renderoc Primer Part A should be sealed and stored in a dry area. Use within 14 days.
Packaging: Available in 5 Kg

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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