Was using the spray on 2 of our horses but with the heat, humidity and bugs so bad we ran out of it quickly so switched to the salve. Goes on well and lasts longer. Works well but need to keep applying as horses get hot and sweaty, and then bitten by bugs and flies a lot, while turned out during the day in our Florida weather. Their itchy skin and constant rubbing, under these environmental conditions, makes the welts and sores so much worse.