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A very reputable fisherman that had logged 1000's of hours fishing, smoking, and drinking told me this about the wd-40:Put it on every time. Why? Cause it sticks to your smelly oil and this disapates when it his the water. That leaves your lure virtually scent free.
Tommyh there is no question that oil based scents stay on the lure longer and when a fish bites on to that lure or bait they do get a burst of some thing different and that may cause them to hold on to the lure or bait longer, as well as the oil based scent do bond with the human scents on the baits and lures to help them contain them! B_C