Some of the back yard sprays have other chemicals included along with the permethrin. I made sure I was using the Permethrin 10 from tractor suppy. It was the only MSDS that I compared to Sawyers.
Are you shaking the solution very well prior to spraying? If there is water in the solution it has to be well mixed for the concentration to be consistent. If spraying on a hot sunny windy day the evaporation rate would be higher than on a cooler overcast day. This may be why there is a difference in smells. Or maybe the solvent is different. Do you have the MSDS for the product?
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