I'm new to this spraying stuff, and just did a test run today. We have a 60 gal tank (really holds only 55) and the spraying systems lawn gun. We measured off 1000 sf and sprayed it. We used 18 gallons. So we mixed the chems and sprayed the yard accordingly. I must have started overlapping more or slowed down, because I estimate that I was closer to 25 gal/k towards the end. We were using barricade and triplet. The gun is spraying maybe an 18" swath. As you can imagine it took forever. We didn't time it but probably 3 hrs to do a 11,000 sf lawn What are we doing wrong? I guess one problem may be my assumption that the area should be completely blue when done. Is this correct? Basically I mean that the grass looks painted, no areas of yellow at all really.