I have had the same experiences as TrentonG with skunks, they don't always smell and many times while camping they come right into camp looking for scrapes. We had one come right into the tent one time and my buddy just chased him back out and no smell at all. Another time one of the guys was eating his oatmeal before going out hunting and the skunk came right up under the picnic table, he didn't even know it was there till he stood up.
Our local pest control guy told me that he has removed tons of skunks from under peoples porches and decks that never knew they were there until a neighbor told them they saw the skunk going under the porch. My brother had one that would sneak into his neighbors yard to eat the apples and even when his dog or the neighbors would chase it the skunk didn't spray. The only time it sprayed was when my brother's dog finally managed to grab it while it was escaping under the fence, what a mess that was!
I agree that trappers know a lot about scents and covering scents as well. From personal experience with Fox the deer just seem to be really curious of that scent. I hunted with my buddy who used it frequently and many times I've watched deer follow his trail right to his stand. Now most of the deer are does or immature deer I don't think I've seen a mature buck do the same.
I even tried Evercalm but had mixed results with that as well, some deer totally ignored it while others were curious, and some would mill around nervously for a while. Other guys I talked to said it worked great for them and seemed to do exactly as claimed, calm the deer. I guess like people scents affect deer in different ways based on their experiences to certain scents positively or negatively.
Another reason I shyed away from using skunk scent was years ago one of the guys in our bowhunter shooting league left a bottle on his dash and the bottle tipped over and leaked into the vents. Needless to say that no matter what he did he couldn't get that skunk scent out of the truck for months. He would drive with the windows down even in the coldest weather to avoid the stench....
Roger,