These responses are why I love you guys. I know I can catch them without it. And I can think of 2 that I know I didn’t use it. 2 out of the 64, I caught this year. When I put a fresh worm and shrimp on, sometime I just cast it out without WD. But even with fresh carp I used it. I have kept a record all this year. Time and size of each fish. And I will total and average them up. It will be in the 10 minute range I’m sure. If I don’t get a bite in 30 minutes I move. But I have not caught one over 26 1/2 " So the big ones might not like it.
As kids in the 80’s & 90’s, we swore by WD40…now its a big joke between my friends and I. We like to claim that whoever happens to be catching the most fish on any given fly fishing trip, happens to be slathering their streamer in WD40, LMAO. I would never use that stuff now, or ever recommend anyone introducing those chemicals into waterways. Blast from the past though! 
Last winter my brother and I were ice fishing at Strawberry. While he was cutting up some chub he nicked a finger. The bleeding was (relatively) profuse. He went right ahead, baiting up with bloody fingers. His catch rate improved a lot. We both decided it wasn’t worth it to purposely cut ourselves to get the hot scent of the day. But if YOU are that crazy, let us know how it works :D.
FWIIW another time at Strawberry I was fishing near a guy who I understood was a DWR employee. He was pulling in a fish every time he dropped a baited hook down the hole. I began to watch to see what he was doing. He was spraying something on each bait. It sure looked like a WD-40 can but I can’t say for sure.
To be brief…interesting…
And, I have a hard time seeing any citations given for using it. If so, all those boats using the lake would have to be cited too. And I don’t use WD-40…or do I? Guess that will remain unkown. 
Anglinarcher. That is some of the best shit, I have ever read. Pat and me have discussed WD a lot. Your Berkley talk is absolutely great reading, but never factored in WD-40. Wasn’t that what this thread was supposed to be about.
And you might very well be right RonPaul, I love Utah Lake so much. It has been so good to me through the years. And when I cast those red and white bobbers I have complete confidence they will move soon. It could be more confidence than WD-40 that makes me so good. But I sincerely think I catch more with it. When we do get over this covid, I will challenge anybody to come on my boat and fish with me, there scent against my WD. Catfish and Utah Lake only.
‘MWScott72’ pid=‘1102486’ dateline=‘1593738859’ wrote:
To be brief…interesting…
And, I have a hard time seeing any citations given for using it. If so, all those boats using the lake would have to be cited too. And I don’t use WD-40…or do I? Guess that will remain unkown. 
There is a difference between Intentionally introducing something into the water, rather than in the course of normal operation of a vehicle.
If you were driving down the road knowingly spewing oil all over. A ticket might be in order as opposed to what drips from a vehicle or boat during normal operations. I’m just saying there is a difference.
Thought this might be a topic worth some consideration.
Not to rain on anyone’s parade, but using WD40 as a fish attractant is maybe not the best idea. It is a petroleum distillate and could be considered introducing a pollutant in to the water. Technically illegal. For years it has been rumored to have “fish oil” in it, It does not. Many people use it for fishing and it does work. You hear of its use in both fresh and salt water. There are other safer biodegradable/natural oils fish attractants that also work. Maybe better to use those. ( Ask Tube Dude he is master of fishtactular potions and concoctions to appease and entice the olfactory senses of fishy critters) People may say its only just a little squirt here and there. Years ago I was fishing out at bird island on a calm day and there was a boat about a hundred yards away using WD40, we could hear them asking for the can. Every time they cast a bait out a huge circle oil slick would appear. They were catching fish, but not any more than we were, and we were not using it. After an hour or so their was an oil slick covering a few hundred yards. Not sure that is a good thing for the lake.
Years ago a Dr. did some studies on scents for fishing, a conclusion he came to was that fish like things that smell and oils trailing off in many cases it helps. Another thing he concluded was often. it was not the particular smell that worked but just the fact that it smelled. He would clean and “sterilize” a lure, then add something to some and then use the other “clean”. In almost all cases the Clean ones underproduced the ones that had 'anything" added to them. Just my two cents worth, but maybe WD40 is not a good idea to put into our waters. Experiment with other safer scents and see what happens. Tons of fish are caught by folks that have never used it. One other note: Berkley is of the leaders in scent research in regards to angling. I was fortunate to tour their test tanks and facility many years ago. In talking to one of the researchers he told me some interesting things. Two widely used scents/additives that anglers use and many seem to think work were Garlic and Salt. In their research they showed they were very ineffective and were not very attractive to fish. He also said the main reason salt got its place in plastic lures was that it was cheaper than the plastisol used to make the baits so they could make more lures with the same amount of plastic and it was cheaper so they made more money. In some cases it could make the bait softer for better action or feel. A good angling buddy always used banana smelly jelly for all fish. I always used shad. crayfish. anchovy. sardine etc. He always caught just as many fish as I did and when I asked him why banana he said my hands and gear smell better and the fish seem to like it to.
Food for thought and just my 2 cents worth ! Would be interested in other thoughts and or opinions.