Get the most out of your weed-control PROGRAM - increase herbicide effectiveness by adding Surefire crop-oil surfactant. It enables herbicides to aggressively penetrate target plants for significantly increased kill rates. It also helps herbicides stick to plants through mist and dew, decreasing the odds of costly and time-consuming respraying. Sure-fire Crop oil plus is highly recommended as the surfactant or oil additive that must be used with slay. Sure-fire Crop oil plus is also highly recommended for use with Arrest max to control perennial and mature grasses.