You can't cover a scent with another one....

If it was true then a deer couldn't smell your foot step on the ground where there are many odors stronger than the foot step you left behind. Walk across a corn field and then bend down and sniff the ground were you stepped. The strong smell of dirt and corn stalks are all you will smell....yet a deer can pick up the "weak" scent of your footstep or another deers step with no problem.

How do you think a dog can smell the scent of animals in the outdoors with so many other scents around ? They pick out scents on a molecular level. That's how. You can add other molecules to the mix but they can pick the different ones separately not as one big scent.