RE: Kill scent on Rubber Boots??
On a serious note: try to step in the smelliest natural item in your woods prior to walking to your stand.
Mine was always a semi fresh cow pie.
Spray on scents don't last very long on rubber boots because rubber boots are not porous.
The cow pie chunks on your boots and will at least make the walk to your stand. Once at your stand, quietly tap your boots against a tree to knock off the chunks.