Kills weeds and prevents new weeds for up to 12 months 7 day visible symptoms. Rainproof after 12 hours Available in 750ml, 1L or 3L big gun The Yates pathweeder range is a total weed control solution for paths and driveways. This advanced formula is a combination of a systemic herbicide to kill existing weeds and a long lasting herbicide that prevents new weeds germinating for up to 12 months.