Was wondering what you guys have used to spray fence lines and around a running track of schools? I used round up last year but it did not last very long. I would use Sahara dg but it is a soluble powder and I think I would have problems in my backpacks and 4 wheeler sprayer. Primatal worries me because of its leaching potential. Pbi Gordan had a product called vegemec was this a sterilant? It looks like it has been discontinued. Thanks guys.