I stocked up with Muskol spray on Friday--it's the best I've found & goes the furthest of any of the repellants, just because it sprays in such a fine mist. I was hoping I wouldn't need to use it for at least a few days yet, but the mosquitoes came out with a vengeance Friday night. THe horses couldn't even go out to eat their hay, and when I came out with the spray some of them crowded around me, each wanting to be the first one sprayed. Once they got sprayed they happily went out to eat; I find the spray gives them some relief right through the night, as long as it doesn't rain.