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, it 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. Use Roundup to kill weeds. Fast. (Consumer Guarantee: If for any reason you are not satisfied after using this product, simply send us original proof of purchase, and we will refund the purchase price.)