I'm thinking of using Ironite because I'm still trying to gain enough knowledge and confidence to use a more standard fertilizer. I still have a slight fear of burning someone's lawn. I know Ironite will stain concrete, so now I'm even afraid to use this. Now I'm afraid the rain will carry this stuff on my customers driveways. To those who have use this, what do you do to avoid it running onto driveways, and how long does it takes to turn the lawn green?