I don't use anything for a cover scent, but after three times this Fall where a doe hit my foot trail and was stopped from coming farther, I started spraying a couple "spritzes" of Deer Dander on my shoe soles.
Ironically, in many more trips out since then, I've had some close encounters, but never ONE time, that a deer walked where I had to see its reaction!
Any time I have ever used James Valley scents or anything, it has been the same story. I don't know if any of it works for me, because no deer has ever been where they might smell it! Either no deer sighting that day, or they came in the "wrong" way...