Roundup Fast Action Ready To Use is a non- residual, rapid acting weedkiller that’s rainproof after 30 minutes and starts to work on most broadleaf and grass weeds within 12 hours killing roots and all. It’s not active in the soil and can be used for spot treatments in rockeries, lawns, lawn edges and garden beds as well as driveways and along fence lines. This ready-mixed formulation comes in a convenient trigger packaging with an innovative spray head, drip guard and 2 spray patterns – including foaming.