Sovereign SBR Bonding Agent
High-Strength Styrene-Butadiene Polymer Additive for Render, Screed & Repair
A milky-white dispersion of carboxylated styrene-butadiene copolymer specially modified for use as a bonding agent and additive. Unlike PVA, it does not re-emulsify, making it ideal for waterproofing, tanking, and external applications. Provides improved adhesion, flexibility, water/salt resistance, and durability in cement-based systems.
Key Benefits
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Superior adhesion to dense or hard-to-bond substrates—concrete, glass, metal, tile & brick
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Enhances strength & flexibility, reducing cracking, shrinkage, dusting; improves frost resistance
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Improved water and salt resistance, supports durable external use and tanking systems
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Non re-emulsifiable—perfect for damp zones, waterproof renders, screeds, and concrete repairs
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Contains antifoam & antioxidant additives to enhance mix stability and longevity
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Boosts carbonation protection, safeguarding embedded steel in repairs; increases abrasion resistance
Product Details
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Form: Milky-white liquid, S.G. approx. 1.01, pH 9–11
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Solids Content: Around 47% polymer
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Pack Size: 5 kg tub (also available in larger quantities)
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Non-combustible & eco-friendly – water-based with no fire hazard
Typical Uses & Mix Ratios
Primer Coat
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SBR Bonding Agent: 1 part
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Water: 5 parts
Apply the primer to porous backgrounds. Render can be applied to either wet or dry primer.
Sealer Coat
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SBR Bonding Agent: 1 part
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Water: 3 parts
Apply to the rear and edges of timber before fitting and tiling to reduce moisture ingress. Do not prime the face to be tiled.
Bonding Coat (Slurry)
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SBR Bonding Agent: 1 part
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Water: 1 part
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OPC (Ordinary Portland Cement): 1½ parts
Apply the bonding coat while still tacky, before applying renders or screeds.
Safety & Handling
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Not classified hazardous, but avoid eye/skin contact; wear gloves, goggles, and suitable clothing
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Can cause mild skin/eye irritation – rinse thoroughly and seek medical advice if necessary
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Non-flammable, store between +5 °C and +35 °C, protect from frost and direct sun
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Eco-aware disposal: Avoid drain contamination; dispose per regulations
Ideal For
- Bonding renders or screeds onto dense, non-porous surfaces
- Durable external renders, floor toppings, screeds
- Concrete repairs (steel protection, carbonation resistance)
- Waterproof/weak substrates—tanking, damp areas, tanking systems