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SBR Additive

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£19.70 Ex VAT
£23.64 Inc VAT

A high performance and multi-purpose water-resistant SBR additive. For use as an SBR primer, and creating durable and flexible SBR slurries and renders.


SBR Bonding Additive - 5 litre and 15 litre

Permagard SBR is a high performance SBR additive. It is very adaptable, being highly effective as an SBR Primer, or as an admixture to create SBR slurries and sand/cement renders and more. It dramatically improves adhesion as well as the water resistance, flexibility and durability of renders and slurries.

Permagard SBR is available in a 5 litre and 15 litre container size.

Our SBR bonding agent is designed for use both externally and internally in areas of intermittent or continuous water contact. It is ideal for dry substrates to prevent suction as well as non-porous and extremely flat substrates.  

Uses of SBR Additive

Our SBR additive can be used in various mixes for different applications. These include: 

  • SBR Primer - used as a primer on a wide range of surfaces to improve adhesion.
  • SBR Slurry - used to improve adhesion and flexibility of cement-based mixes onto surfaces of low suction.
  • SBR Render -  used as an SBR additive for sand/cement renders to produce dense impermeable renders in areas where water or chemical resistance is required.
  • Bedding Mix - used for bonding tiles, kerb stones, coping stones, mosaics, brick slips.
  • Patching Mix - used for patching renders or concrete.
  • Damp Proofing - used as a slurry for basements where dampness is expected from behind the plaster.
  • Flooring - used to produce high quality, hard-wearing floors.

How to use SBR additive

Each different use of the SBR additive has different mix ratios and application instructions. We cover the three main uses below, but our data sheet features more information on the other applications.  

Preparation for applying SBR

All surfaces should be sound and load bearing. Make sure they are free from anything that could interfere with adhesion such as any loose materials, oil, grease and surface water. The surface of the substrate should be dry or matt damp.

SBR Primer

The most common use of the additive is as a water-resistant SBR Primer. When mixed with clean water, it can be spray-applied onto a range of surfaces. The SBR primer will improve the adhesion of screeds, slurries and renders.

SBR Primer Mix Ratio

Simply mix the SBR additive 1:3 with fresh clean water to create the primer.

Applying SBR Primer

Full PPE should be worn. You can use a brush or a sprayer such as our Tukan Pressure Sprayer to spray the SBR Primer onto the surface. 

Important note: thoroughly clean the spray unit and nozzle immediately after use otherwise this could render the spray unit unusable. 

SBR Slurry

An SBR bonding slurry is recommended to improve the adhesion of cement-based mixes onto surfaces of low suction. It’s also ideal as a treatment prior to applying any SBR-modified mix.


Before applying your SBR slurry basecoat, prepare the surface by using a mechanical scrabbling or grit blasting. This will remove any surface laitance or loose material that may stop the SBR Slurry from bonding to the surface, giving a clean fresh exposed surface. If you are dealing with high suction surfaces, you need to thoroughly dampen them and even prime it with an SBR Primer mix before the application of the SBR slurry. You want a matt damp with no standing water. 

How to mix SBR slurry

Start by charging the mixer with the required quantity of sand and cement. Pre-mix for approximately one minute. Pour the desired quantity of SBR Additive and mix for about 30 seconds only, to minimise air getting into it. Slowly add water whilst still mixing, until required smooth creamy consistency is achieved. Always stop the mixer when testing consistency. The total mixing time after adding the SBR Bonding Additive should not exceed two minutes. 

Mix Ratio for SBR slurry

The approximate SBR slurry mix ratio is 1 part SBR: 1 part water: 5 parts cement (by volume). The resulting SBR cement slurry gives an approximate coverage of 30m² per 5 litres of SBR per coat.

Note: Do not over mix - you want to prevent excessive air in the SBR slurry. Hand mixing is strongly recommended.

Applying the SBR Slurry

The SBR slurry should be brushed vigorously into the surface with a stiff brush to an approximate 1mm thickness. Take care to ensure complete coverage. Apply subsequent coatings such as your render or top coat while the bonding slurry is still wet. If the slurry dries out then a further coat must be applied at right angles to the first.

SBR Render

By adding SBR additive to renders, you can produce dense impermeable SBR renders that are ideal for areas where water or chemical resistance is required.

Mix ratio for SBR render

For SBR render follow a mix ratio of 1 part Ordinary Portland Cement: 4.5 parts moist washed sand: 0.2 parts SBR Bonding Additive: water as required (i.e. 10 litres of SBR Bonding Additive per 50kg of cement). 

Applying SBR Render

Apply render onto tacky primer. The first coat should be limited to a thickness of 7mm. Scratch the surface and leave to set before applying the second coat of a similar thickness. For added protection leave the first coat overnight then apply a second bonding coat before the second coat of render is applied. The final coat should be trowelled/floated to a smooth finish as the work proceeds. In severe drying conditions, render should be kept damp for up to two days to allow the cement to cure.

Please download our data sheet for information about mix ratios and coverage details. Also check the FAQ tab on this page for more details.

Permagard - Providing Solutions. Inspiring Confidence. 

Permagard are proud to stock high quality waterproofing chemicals and additives to make your life easier. We stock a wide range of damp proofing products and building chemicals. If you have any questions about using the SBR bonding additive then call our team on 0117 982 3282.


  • Improves adhesion and bonding - excellent adhesion to steel & concrete. Sticks well to brick, glass, asphalt, wood, expanded polystyrene and most building materials.
  • Suitable for use in damp conditions
  • Greatly increases strength
  • Improves workability, durability and abrasion resistance
  • Reduces shrinkage and cracking and improves flexibility
  • Improves chemical and water resistance
  • Allows reduction in water content
  • 48% solids content (Professional grade)
  • Good frost resistance and resistance to water-borne salt penetration
  • Enhanced corrosion protection
  • Proven performance for 25 years
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