Roundup 5700010 1.33-Gallon Extended Control Weed & Grass Killer Plus Weed Preventer Pull 'N Spray Use to kill existing weeds and to pre-treat weed-prone areas such as driveway and sidewalk cracks, patios and paths, tree rings and mulched areas Starts working immediately with visible results in 6 hours Rainproof in 10 minutes, control that won't wash away Ideal for large jobs Pull 'n spray applicator eliminates hand fatigue, one pull equals 25 trigger sprays