Roundup Dual Action 365 Weed and Grass Killer Plus 12-Month Preventer Concentrate provides 1-step weed protection for up to 12-months. This weed control kills and prevents many types of tough weeds and grasses for up to 1- months, including clover, dandelion, large and smooth crabgrass, poison ivy and other broadleaf weeds, grassy weeds and brush. It is rainproof in as fast as 30-minutes and produces visible results in hours. Use Roundup Dual Action 365 Weed and Grass Killer Plus 12-Month Preventer where you want to kill existing weeds AND prevent new weed growth for up to 1-year, such as cracks and crevices in driveways, sidewalks and walkways, patios, paths and under decks, gravel areas and other non-lawn areas. Mix the concentrate according to label directions and spot treat or spray evenly each gallon of spray solution over 300 sq. ft. with a tank sprayer. Please note, to prevent new weeds and grasses from growing, YOU MUST SPRAY THE ENTIRE AREA you want to control, NOT JUST the emerged weeds. 1-32 fl. oz. bottle makes up to 5.3 gallons (see booklet for mixing instructions) and covers up to 1,600 sq. ft.