WD 40 Horrible Stuff
Wd40 not the best thing for reels either. It'll strip the grease out. So great for cleaning the reel prior to regreasing the workings but not best to leave it sitting on your bearings or gearing.
WD is basically a penetrating oil, which because of its viscosity , as Piker correctly said, thins out other oils.
This maybe the effect it has on baits, as it thins out, carries, and spreads other oil based scents within the original baits.
If it had any real attractant power, why do they not spray a piece of sponge with WD, and put that on the hook? :sad:
Many mechanics use to hate it as it use to rot any electrical components it was used on / ( Perishes rubber quite quickly.).
For reels, High speed like multipliers, rocket fuels are good, but expensive for what they are....thin lubricating oils.( Viscosity isn't always a good guide, as Hydraulic oils are thin, but don't have the lubricating properties of a designated lubricating oil, graphite, etc.).
I use 'Singer sewing machine oil', cheap as chips on fleabay, and comes in a very handy small squeezy bottle with along thin spout...ideal for dropping one, or two, drops into very small bearings.
For any low rotational speed applications, where pressure between bearing faces is the main factor... Crown gears, etc. Grease !
I have several exotic choices available, being in engineering, but a, small tub, of standard ' Lithium Grease' out of halfords will last you several lifetimes ! Salt resistant so good for the sea as well.
You still need to change it regularly tho. That is the main thing, same as oil changing your car !
And don't slap too much on !
I personally use Black Moly...messy but very effective, with superb lube properties, sticks like the proverbial, doesn't really suffer cold, or congealing, but does need regularly applications, because it can spread / throw.
Cleaning out old grease...paraffin...or diesel if you can stand the pong, and a stiff paintbrush, Q tips !
Bait additives... Van den Eynde ..'Liquid Pellet' ( Basically a very thin fish oil, think Pilchard-ish ?), used to be very effective. ( Gets bl**dy everywhere though, and just when you think its gone...it rains and you can smell it all over your gear / Car / clothing, again !).
Also the nash 'Skopex', ( Squid Oil ), was very popular, and I had all my Cod on squid this year ?
Hope that helps !
mel.....