I use scents to attract but not to cover. Only because I found they did not really work. I fell for the hype one year and bought special soap to wash your camo clothes, and then soap to wash your self, and even a spray to shoot your boots and stuff so you "left no scent." Well guess what.. a buck walked in an busted me in the wind just like they always did.
So I use the wind. "Wind in my face I am in the right place." Cover scents like pure Mexican vanilla ( my folks purchased me 10 quarts when they were in Mexico on vacation), and yes even my own urine has produced some very curious deer and one bear was in love with that vanilla.