Bostik SBR toughens, waterproofs and improves chemical and abrasion resistance of renders, screeds and mortar. It is an excellent all round primer and bonding agent and is especially suitable for external applications. Bostik SBR can be used for waterproof rendering, flooring screeds and toppings and for bonding renders & suction control. It is a specially modified Styrene Butadiene Copolymer Latex for cement and mortar.