Sherwin Williams FasTop Multi SL45Sherwin Williams FasTop Multi SL45 is a polyurethane cement self levelling resin floor screed designed to provide very heavy duty usage with resistance to thermal shock, abrasion and chemical attack in aggressive industrial environments. Available in a 19. 1kg unit. The system utilises universal FasTop Multi bases, hardeners and colourants in combination with a specific aggregate to provide smooth seamless matt surface with good anti slip properties.