Decades ago, when Original Fish Formula (an anise-scented oil) came out, I squirted some on the chenille body of a crappie jig with a marabou tail. Unfortunately, the oil flowed down onto the marabou and caused it to clump together in a stiff mass; it wouldn't move underwater in the way that lets marabou give life to a jig. Though I had just caught a crappie on a bass lure (suggesting an aggressive feeding mood), I couldn't get one to hit the oiled jig, and couldn't work the oil out of the feathers holding the jig in the water (had to use detergent later at home).

JuHair would probably be less likely to clump, but I've been leery of applying oil-based scent products to anything but plastics since.