Kills and prevents weeds for up to 12 months by creating an invisible barrier in the soil Kills weeds to the root. Guaranteed!* Use on driveways, patios, sidewalks and gravel areas Rainproof in 30 minutes Visible results in 12 hours Roundup Concentrate Max Control 365 kills and prevents weeds for up to 12 months by creating an invisible barrier. Not only does it kill visible weeds, but it also kills them down to the root, guaranteed!* Simply add 6 fl. oz. of concentrate to one gallon of water in a Roundup Brand Premium Sprayer. For use on driveways, patios, sidewalks and gravel areas, Roundup Concentrate Max Control 365 is rainproof in 30 minutes with visible results in 12 hours. Roundup works. Fast.