Scent Killer kills human scent on contact, at the molecular level. It keeps human odor from forming a gas. When the human odor doesn't form a gas there is no smell. Scent Killer is totally odorless when you first put it on and keeps you odorless even after it dries. It is so effective, it works for days after drying. Putting a liberal application of Scent Killer onto your hunting clothes turns them into a scent elimination suit. After allowing your clothing to dry, it can be stored in a bag or airtight container for weeks or even months before use.