Those scent facemasks are about as effective as a chick farting in a tube skirt. What I am talking about is a WWI-style gas mask looking mouth/nose covering device with a tube down into a can of activated charcoal.
They do not make them, I know because I have looked. The best you can find is a painters mask, however the valve would need to be reversed to keep the air from getting out past the carbon filter rather than in through it.
As you can probably tell, if they had them I would probably buy one and carry it to the field.
However as far as strict scent control routine goes, you are setting a super high bar for yourself when you expect to wash your activated carbon clothes, air dry them, spray one side with scent killer, air dry it again, spray the other side with scent killer, air dry it a third time, then run it all through the dryer to reactivate the carbon, put in scentlok/block/free container, carry scent free container to hunting location, stop 200 meters short of you stand, in freezing temps strip down to bare skin, spray said bare skin with scent killer spray, redress in activated carbon, and get in tree.
Even after personally doing that for several seasons I would get busted.
Therefore, if this article is correct even JoeRE can take his three color camo and make it essentially as effective as activated carbon:http://www.fieldandstream.com/articles/hunting/2014/07/does-it-work-ozone-scent-control-vs-drug-sniffing-dog?src=SOC&dom=fb
Which states: “before … the dog had found Bob almost immediately. Yet the addition of ozone confused that nose for nearly one minute, which amazed everyone.”
The article says treating clothes with ozone is almost as effective as an $800 ozonics setup (which I do not own due to cost). What about simply putting all your hunting gear and clothes in your truck cab and running an ozone generator in there the night before hunting?