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