• SBR (styrene butadiene) latex that increases the flexibility of screeds and mortars
• Improves water and chemical resistance and durability
• Excellent waterproofing admixture that reduces shrinkage and cracking
• Works as a bonding agent for new concrete onto old
• Also a general primer and key coat for low-porosity substrates
• Interior and exterior floors and rendering; 5 L

First, decide the role. As a bonding agent or primer, brush a coat onto the clean, sound substrate. As an admixture, add it to the mix.

Next, for a slurry bond coat, gauge cement and SBR to a brush-applied slurry, then lay the new screed or render while it is still tacky, wet on wet.

Then, as an admixture, replace part of the mixing water with SBR to add flexibility, adhesion and water resistance to the screed or mortar.

Finally, it suits areas of continual or intermittent water and chemical contact, inside and out. See the data sheet for mix rates by application.

• Product code: BDH040
• Type: styrene butadiene copolymer (SBR) latex admixture and bonding agent
• Benefits: flexibility, water and chemical resistance, durability, reduced shrinkage and cracking
• Uses: admixture, bonding agent (new to old concrete), primer, key coat, repair patching
• Suitable for: internal and external floors and rendering
• Conditions: areas of continual or intermittent water and chemical contact
• Size: 5 L

What is SBR used for?

Three main jobs: as an admixture to add flexibility, water resistance and durability to screeds and mortars; as a bonding agent for new concrete onto old; and as a primer or key coat on low-porosity surfaces.

How do I use it as a bonding coat?

Mix cement and SBR to a brush-applied slurry, paint it onto the clean substrate, then lay the new screed or mortar wet on wet while the slurry is still tacky.

Can I use it outside and in wet areas?

Yes, it suits internal and external floors and rendering, including areas with continual or intermittent water and chemical contact.

Does it stop screeds cracking?

It improves adhesion and flexibility and reduces shrinkage and cracking when repairing or laying floor screeds.

How is it different from PVA?

SBR is water and chemical resistant and suitable for external and damp conditions, where PVA is not. Use SBR outdoors and in wet areas, PVA for internal priming and bonding.

How much do I add?

Dosage depends on the application, so follow the technical data sheet for admixture, bonding and priming rates.