Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer with Sure Shot WandThe dual action formula of Roundup kills existing weeds and prevents new ones from growing for up to four months and it kills them down to the root, guaranteed! Plus, the Weed & Grass Killer can be used on driveways, sidewalks, patios, along fences, curbs, retaining walls, and edges of lawns, as well as on decorative rock or gravel areas. Kills existing weeds and prevents new ones from growing for up 4 months! Rain proof in 10 minutes and visible