sknhgy 

Clean my chain. Then sometimes I lube it with 30W/mineral spirits and sometimes I just leave the WD-40 on it. Works better than the manufacturer's chain lube. Doesn't attract as much grit.

Also, (when I'm feeling impish) I can yank some peoples' chains by saying how much I like WD-40.

toofastgt

Wd 40 is good for certain things, But there are better things to do the same job!!! NO WHERE on the can does it say it is a lubricant!!! Do not use it as lube!!! It is 80% kerosene it will wash proper lubes and grease out of bearings and contact points!! If you need to clean a chain buy a 1/2 gal of kerosene and soak the chain in a bucket, brush, let dry then use a proper chain lube! Maxima chain wax (for motorcycles) works good and doesn't attract grit or leave residue! Use silicone spray for cables, waterproofing distributors.
White lithium grease spray for sliding contacts pivot points. Pb Blaster spray for freeing stuck nuts and bolts, reconditioning O rings and rubber. You could use WD-40 but if you just put kerosene and 10% 30 weight oil in a spray bottle you will get the same results! It is good for removing decals, protecting bare steel and killing things I guess! Try a couple of drops of gasoline for grips it makes them slide on easy then it vulcanizes the rubber so it bonds to the bar(if you rough up the grip area first with sandpaper!)

Bill Kapaun

Works as starting fluid for diesels.

stokessd

It also has gotten a beat up old POS car running in the rain when it's ignition wires got wet. Aside from that, it hasn't helped me much.

It's kind of like duct tape, there's only one real use for it, but nobody uses it for that. And all the other uses make a huge mess.

Sheldon

norco_rider77

sweet, so many uses

humble_biker

it's a great solvent and isn't a lube.

urbanknight

It has been very useful at attracting dirt for me. I don't use it on my bike.

edit: bike, not bikes. I had to sell one

San Rensho 

Boy, people really get worked up over WD40, this topic has caused more virtual fist fights than almost any other topic.

WD40 is a mild solvent and a mild lubricant, its not very good at either one. Its a mild solvent just like kerosene and diesel are mild lubricants.

About the only thing I use it for on a bike is to flush out and lubricate brifters, since they are sealed units and you can't disassemble them to clean them. I hang the bike upside down, spray the entire mechanism with a strong stream of water from a hose to get all the sweat out of it, then flush the brifter with WD40 a couple of times as I shift through the gears.

rmfnla

Interesting to note that nobody mentioned its intended use, as a water displacer (WD; get it?).

I like it for cleaning road grime off my bike frames; really brings out the shine of the paint, too..

Artkansas 

Its good for cleaning your hands with after you've been working on cars or other greasy objects.

norco_rider77

so its not recommended for chains then? i have used it once or twice because i ran out of lube.

byte_speed

In my ignorance, I used it to lube the chain on my first bike, sprayed and wiped the chain before every ride. The chain wore out after only 20,000 miles (logged). I gave it up because of the mess.

Wordbiker

Once after huffing it, I had a religious epiphany, became a Baptist...then later changed my mind when I found out they didn't allow dancing.

norco_rider77

nice...

der Rabe

Dunno' 'bout "amazing", but I've used it to loosen up grumpy padlocks and combination locks on cables that are exposed to the elements.

Dan Burkhart 

Did he ingest it or use it topically?

tellyho

Ha! Topically. Too bad it didn't cure his virulent racism as well.

halfspeed

WD-40 is the first resort of bad mechanics of all types who live by the motto "if it moves and it shouldn't, duct tape; if it doesn't move and it should, WD-40."

I suppose it has its uses, but I spent enough years cleaning up the messes and mindless kluges of WD-40 devotees that I'd rather not have it in my garage.

So the most "amazing" things I've seen with WD-40 are all craptacular repairs that save time in the short run and cost more in the long run.

Dr. Jakal

PB Blaster works SO MUCH better then WD40 at getting rusted bolts to move... and doesn't leave behind the mess.

ajrikli

My buddy's dad is in charge of supplying the stuff for North America, so I get cans of it for free whenever I want. I've used it on my bike a few times, but I understand what people say about the mess. I also agree that it's a better solvent than lubricant, but I'm not really an expert.

Winter76

Definately good for getting grease etc off of the bike and for rust proofing the inside of a steel frame. For your chain however use something like ProLink Gold (you can get it at MEC). The only good use I've found for WD-40 as a lubricant was to lube the hinges of an interior door at work.

AlmostTrick

I have no need for WD 40 on my personal bikes, as they are maintained properly. But I do find it handy when working on old beater bikes. It frees up any rusty or gummy parts quite nicely. You just need to follow up with a proper lubricant afterwards.

I agree PB Blaster works better for really rusty stuff (like automobile bolts), but it seems like over kill on most bike parts. Not only does it cost more, but its caustic vapor is highly objectionable and probably more hazardous to your health than WD-40.

koine2002

Squeaky door hinges and a solvent one time when someone used up all of my degreaser.

miami#1

cures ringworm on a dog

p4nh4ndle

good for freeing rusted parts, keeping flies off garbage, curing impotence, etc.