Wow, talk about a lot of traffic! I read almost all of the posts in the last 9pgs, and I'm very glad to see so many guys with common sense in their heads.
Play the wind. End of story.
I grew up calling coyotes, and without a doubt, there is no way to disguise or hide your scent from a canine nose, so I learned to never worry about scent cover for coyotes. Then when I started deer hunting as a teenager, I admit I thought at that time I needed all the clothes and chemicals I could get. But eventually it hit me, coyotes sense of smell is drastically more adept than that of deer, and I had been killing coyotes for many years without using any cover except that which God provided (the wayward winds) so wtf was I using the scent cover on deer for?
99% of experienced coyote hunters will tell you that scent cover is a waste of time and money, the wind is free. It's only deer hunters that seem to think they need all of this hyped up junk.