We had a similar problem and finally cured it by spreading Amdro Ant Block around the whole perimeter of our house. It is a bait that they carry back to their nest and share. In about three days we had no sign of ants and so far still none for the past 6 - 8 weeks. Amdro is available at Home Depot and Lowes. Press N' Seal is great, but they still need to be eliminated. Good luck with making them extinct!
9/9/07 at 4:34am