Surfactant for Herbicides is a wetting agent with 80% non-ionic surfactant for increasing the penetration, coverage and overall effectiveness of almost any herbicide. Surfactant for herbicides can be used with almost all herbicide sprays including Trimec, Atrazine, Brush Killer and 2, 4-D Amine. Please check the herbicide product label first to see if a surfactant is recommended. Surfactants reduce the surface tension of water to produce more uniform coverage and penetration of herbicides and weed killers.