I've gone home several times over bad or swirling wind conditions when archery elk hunting in the mountains. This is only after years of being stubborn and hoping to get "lucky" and going in after them anyway. There is no getting lucky with an elk's nose, you either played the wind right, or you blew them out.
Elk will smell your eyeball at 500 yards, so unless you plan on drinking a gallon of the stuff and spaying it in your eye's your wasting your time and money. When I first started archery elk hunting, I used the soaps, and sprays, deodorant, sent control clothing, you name it, and we tried it. Maybe I just stink, but I call tell you without a doubt, I saw absolutely zero difference, still had elk smell me at hundreds of yards.
I think it at times it can make people take risks with the wind that they normally wouldn't. Instead of taking the long walk around to your spot, you take the easy way, thinking you have and edge.
Spray down if you want, but hunt like you haven't showered in a week and you'll be much better off.