Primo is great for such applications. We use it at the golf course I work at around bunker banks. Fly-mowing goes from a once a week event to once every other week or every three weeks. We usually apply at 0.5 oz / 1000 with a spray gun but recently used a spray hawk. I would not go higher than 0.5. A friend of mine at Rutgers just did a field trial and beat up turf pretty well at 0.6 oz / 1000.