Ive never used scents or “scent cover” products, real or synthetic. What I HAVE seen multiple times each is variations on the below two situations:
1) deer follows my trail in to stand—not on a deer-trail, but follows what appears to be my ground scent—directly to me. Since I doubt I smell like an estrus doe (?), it makes me think that stories of deer coming in to attractant scents is just as likely to be curiosity as it is to be an actual attractant.
2) deer gets downwind of my ground scent or downwind of an object I touched, and immediately bolts. Even if Im literally bathing in the scent, I am still putting out human scent that is dispersing downwind, and deer absolutely smell that…whether or not they spook is inconsistent. Covering this up may not hurt (it might hurt, I just cant say for sure) but it seems unlikely to be as effective as some stories make it out to be.
My takeaways are that the anecdotal stories of scents working on deer are just that—anecdotal—and without a large sample set with a control group to actually determine if its the scent that actually caused peoples observations, or if it was random or something else, its just as likely that they dont work as that they do work. In the absense of a actual scientific study to show that they work more often than they hurt, I havent bothered. It probably doesnt hurt in many cases so perhaps it increases your odds slightly, or maybe the confidence boost is helpful…Im just very, very skeptical that in the big picture it does more than very, very slightly assist. If anything that is legit scientific on this topic exists Id love to see it, maybe Id change my tune.