The most important factor when planning to tank mix various herbicides is referring to all manufacturer's product labels for tank mixing restrictions. In this case, because Drive XLR8 Herbicide Crabgrass Killer requires the use of an MSO Surfactant like Prime Source Duo Stick Select in order to be effective, it would not be recommended due to the fact that most Turflon Ester product labels advise not adding a surfactant for lawn treatments as this can cause damage to turf grass.
As long as the application of Drive XLR8 Herbicide Crabgrass Killer had time to completely dry before rainfall it should be fine. If it was a heavy rainfall to cause puddling or runoff, we would recommend a follow up application.
