I will be spot spraying Drive from a backpack sprayer, and need help with the mixing instructions. The label states apply 0.367 oz of Drive 75 DF per 1000 square feet. I will be applying this product in conjunction with the Lesco sticker. 1. How much product should I add to 4 gallons of water? 2. Do I apply just to wet, or to the point of run-off? 3.How do you measure 0.367 oz anyway? What type of measuring device do you use? I w2ill be applying this product to control crabgrass and other labeled weeds growing in established fescue. Thanks in advance for your help. Bill Craig!