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