Sovereign SBR Bonding Agent - For Render, Screed & Repair

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 Superior adhesion to dense or hard-to-bond substrates—concrete, glass, metal, tile & brick Enhances strength & flexibility, reducing cracking, shrinkage, dusting; improves frost resistance Improved water and salt resistance, supports durable external use and tanking systems Non re-emulsifiable—perfect for damp zones, waterproof renders, screeds, and concrete repairs Contains antifoam & antioxidant additives to enhance mix stability and longevity Boosts carbonation protection, safeguarding embedded steel in repairs; increases abrasion resistance Product Details Form: Milky-white liquid, S.G. approx. 1.01, pH 9–11 Solids Content: Around 47% polymer Pack Size: 5 kg tub (also available in larger quantities) Non-combustible & eco-friendly – water-based with no fire hazard Typical Uses & Mix Ratios Primer Coat SBR Bonding Agent: 1 part Water: 5 parts Apply the primer to porous backgrounds. Render can be applied to either wet or dry primer. Sealer Coat SBR Bonding Agent: 1 part 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) SBR Bonding Agent: 1 part Water: 1 part OPC (Ordinary Portland Cement): 1½ parts Apply the bonding coat while still tacky, before applying renders or screeds. Safety & Handling Not classified hazardous, but avoid eye/skin contact; wear gloves, goggles, and suitable clothing Can cause mild skin/eye irritation – rinse thoroughly and seek medical advice if necessary Non-flammable, store between +5 °C and +35 °C, protect from frost and direct sun 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