Evo-Stik Evo-Fix SBR is a specially modified Styrene Butadiene Co-polymer Latex for cement and mortar It toughens, waterproofs and improves chemical and abrasion resistance of renders, screeds and other cement based mixes. It is recommended for use in effluent tanks, dairies, food factories, fertiliser stores and other demanding situations Evo-Stik Evo-Fix SBR is an excellent all round primer and bonding admixture.