KA Products Premium SBR Bonding Agent in a 5 litre tub. A high-strength styrene butadiene rubber additive for plastering, screeds, renders, pointing and more. Improves adhesion and suction control across a wide range of substrates.
QTY
Price
QTY
Each x 5 litres
£13.79£16.55
20
£238.00£285.60
KA Products 5L SBR bonding is a premium high-strength styrene butadiene rubber liquid used as a bonding agent and admixture across plastering, rendering, screeding and general building work. If you’ve ever had a plaster coat delaminate off a difficult substrate, or a screed that looked perfect and then cracked up three weeks later, the answer is usually better prep — and SBR is a big part of that. Diluted and brushed on as a bonding slurry, or added directly into the mix, it significantly improves adhesion and flexibility where plain cement or plaster alone just won’t hold.
SBR has been a staple on UK building sites for decades. The KA Products version sits at the premium end of what is available at this price point, offering good consistency and reliable performance across the typical applications you’d encounter in plastering, groundworks and general construction. It’s not a niche product — it earns its place on the van.
Where KA Products 5L SBR Bonding Gets Used
The most common use is as a bonding coat before applying gypsum plaster to low-suction or contaminated surfaces. Mix with cement and water to a creamy slurry, brush it on, and plaster into it while still tacky. It’s also regularly added to floor levelling compounds as a latex-style admixture, improving flow and reducing cracking risk. Flooring screeds benefit in the same way — particularly repair screeds where bonding to an existing base is critical.
Beyond Plastering
SBR works well for waterproof render coats, patching, repointing, and bedding work. KA Products also recommend it for use alongside their own tanking slurry, where it acts as a primer and bonding agent in the waterproofing system. In suction control applications — think of a very absorbent block or brick that would otherwise pull moisture from a render or screed before it has time to cure properly — diluted SBR brushed on first can save a lot of grief later. It’s one of those products that quietly prevents problems rather than solving them after the fact.
At 5 litres, this is a practical working size for a trade job or ongoing site use. Available in boxes of 20 for anyone who gets through it regularly.
Pro Tip: When using SBR as a bonding slurry before plastering, apply it to the correct tackiness — if it goes fully glossy and dries hard before you plaster over it, you've missed the window and you'll need to re-coat.
KA Products Premium SBR Bonding is used across plastering, rendering, screeding and waterproofing work. Plasterers use it as a bonding slurry on low-suction and contaminated surfaces before applying gypsum. Floorers add it to levelling compounds and repair screeds to improve adhesion and reduce shrinkage cracking. It's also used in waterproof render systems, repointing, bedding and patching work, and as part of a tanking system when combined with a slurry waterproofer.
Best For
Bonding gypsum plaster to low-suction surfaces
Flooring screeds and repair screeds
Waterproof render coats
Floor levelling compound admixture
Suction control on absorbent substrates
Patching and repointing
Bedding work
Compatible Surfaces
Concrete
Brick and blockwork
Sand and cement render
Existing screeds
Gypsum plaster backgrounds
Stone
Key Properties
High-strength SBR formulation
Improves adhesion and flexibility
Controls suction on absorbent surfaces
Compatible with KA Products Tanking Slurry
Suitable as latex admixture in mixes
5 litre working size
Not suitable for: Not suitable for use as a standalone waterproofer without an appropriate tanking system. Not recommended as a direct adhesive for tiles or boards where a dedicated tile adhesive or contact adhesive is required.
For bonding slurry, mix SBR with ordinary Portland cement and water to a creamy, lump-free consistency. Brush or roller-apply to the prepared substrate and allow to become tacky before applying plaster or render. Don't let it fully dry out.
As a mix admixture for screeds and levelling compounds, replace a proportion of the gauging water with diluted SBR, typically one part SBR to three or four parts water depending on the application. Always follow the mix ratios relevant to your specific job, and ensure the substrate is clean, sound and free from dust or grease before applying.
Ensure the substrate is clean, structurally sound and free from dust, grease or loose material
For bonding slurry, mix SBR with cement and water to a smooth, creamy consistency
Apply the slurry to the substrate using a brush or roller, working it well into the surface
Allow the slurry to become tacky before applying plaster or render — do not let it dry hard
For screed or levelling compound use, dilute SBR with water and substitute for part of the gauging water in your mix
Mix the screed or compound as normal using the SBR-water solution
Lay and finish the screed or compound as required, allowing adequate curing time before loading
Can I use this SBR with KA Products Tanking Slurry?
Yes. KA Products specifically recommend using their SBR in conjunction with their Tanking Slurry, where it acts as a bonding primer before the waterproofing coats are applied. It helps the slurry key properly to the substrate and forms part of an effective below-ground waterproofing system.
What dilution ratio should I use for suction control?
For suction control on absorbent surfaces, a typical dilution is one part SBR to three to five parts clean water, brushed on liberally and allowed to dry before plastering or rendering. For bonding slurry applications, use undiluted SBR mixed directly with cement and water. Exact ratios can vary depending on substrate porosity, so adjust based on site conditions.
KA Products Premium SBR Bonding is a styrene butadiene rubber liquid admixture and bonding agent. SBR is a synthetic polymer that, when added to cementitious mixes, increases flexibility, adhesion and water resistance. It reduces the tendency for shrinkage cracking in screeds and renders, and improves the mechanical bond between new and existing cementitious materials. Compatible with Portland cement-based systems.
Brand
KA Products
Product Type
SBR Bonding Agent
Volume
5 litres
Base
Styrene Butadiene Rubber (SBR)
Form
Liquid
Box Quantity
20 x 5L
SKU
KASBR
Size
5
Product Type
Plastering Adhesives
Box Quantity
20, Each x 5 litres
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