John, I had a problem with ants last year and used a film of FGMO around the base. Since my problem was their gaining access from the outside I used my finger and spread it around the base of the hive. I watched a few try to get in through my SBB and the bees kept them out. The FGMO kept them from gaining access from anywhere on the outside and unless we had a bad storm the film stayed on for quite awhile. If I noticed any on the outside of the hive I crushed them in a satisfactory manner and used the same finger (gave me the illusion of an ant head on a pole) to spread FGMO again. This kept them out of my top feeder. Good luck.