I have been able to get with in ten feet of many a deer without any scent blockers or masking !
I think in most parts of the country they are a waist of time and money !
Wise old deer blow for lots of other reasons than just to say I smell something wrong ! I have even seen them blow in hard hunted areas just to see if they can get something to move so they can get a better look !
Don't drive yourself crazy trying to do the impossible !
Take each day as it comes and enjoy it !
The bottom line is generally spend more time with them deer and they will learn you better ,then they will decide if you can be close or far !
Then you can decide if you want to hunt them or sit and wait on one to stumble by in hopes of a shot at him ! There is a big difference !
Enjoy life!
Have fun !!
Guy