Vetobond PB434 is a modified styrene-butadiene rubber (SBR) latex that is supplied as a ready-to-use white liquid. It is designed to improve the quality of site-batched cementitious mortars and slurries. When used as a primer, it works to seal the substrate and enhance the bond to mortars and plasters. Being resistant to hydrolysis, it is ideal for internal and external applications in conjunction with cement.