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Thanks Beep! Just what I wanted to hear.

Any suggestions on how much to spray on? How far should a 25 oz bottle go?

I was able to pick up some 38% Hi Yield permethrin over the weekend. I am trying to figure out the percentages I need to mix for .5%. I am mixing in a sprayer which is 25 oz.

I figured this...

Your math is perfect! 128 oz = 1 gal. So .64 oz ÷ 128 = .005 = .5%