I do home pest/weed/fungus/disease control and fertilize. I work with a licensed operator and in business for a little over a year. I am looking to increase my efficiency. I want to save time blowing stray fertilizer off the paved areas, and with the same unit fog or spray the foundation and trees/shrubbery. I am thinking a Stihl 420s is the ticket. Can you guys help me figure out if I am on the right path. My main question: is the mist that this unit sprays (like a fog I guess, I am not sure) as good as spraying with my BNG? Will it last as long? Will it hold up the same against rain? Can I bug treat a lawn with this unit? Please help me. I am trying to get more done in one day.