I don't use cover scents, but if I was going to, it wouldn't be out of a bottle. I've tried that scent killer spray on my boots before, don't know if it helps or not. I think the wind is the main thing. If you're downwind, you're invisible. If you're upwind, you're busted no matter what you're using. You might be able to fool deer into thinking that you're further away than you really are, though, dunno. I'd like to hunt some of these places y'all are at where you don't have to worry about the wind and that deer don't spook if they smell you-around here, if a deer crosses three hundred yards downwind of you, it'll blow and haul butt away from there. Several times, I've had deer see me and not spook until they smelled me, then it was all over. I think that the nose is what a deer trusts a lot more than its eyes or ears. I've found the same thing to be true of hogs, you can let them see you if you're not making sudden movements, but the second they smell you, they're gone like they were never there.