I have gotten used cooking oil from a local restaurant and mix in the fly control chemicals per the label instructions and spread on my cattle rub with face flaps this oil wont evaporate it don't cause skin irritation like diesel fuel it has no bad odor and its cheap * cheap . I get mine from an Asian grill , they get so little for it from a recycler they give it to me. It works great for me , better than any thing I have tried before and with added ear tags my cattle have ( NO ) . flys