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Never use WD-40 for electrical connections.

306K views 65 replies 41 participants last post by  countryboy843  
#1 · (Edited by Moderator)
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I constantly read how well-intentioned folks tell others to use WD-40 to clean electrical connections and switches. I have been wrenching on cars, trucks, motorcycles, etc for over 40 years and so far the only good use I've found for WD-40 is to dry up a water-laden distributor cap. Give your WD-40 to a neighbor or person that you don't like so you won't be tempted to use it yourself.

Contact cleaner or in a pinch lacquer thinner or denatured alcohol should be the only thing you use to clean an electrical contact. WD-40 should never be used near anything that you want to remain free-moving for any length of time. Within a couple of months, WD-40 turns into a gummy substance that attracts all kinds of dust and dirt.

Yes, it will free up a switch, for a while. But be aware that so will light machine oil. Neither of which you want on your electrical contact, especially ones that move, like in a switch. So will soap and water, kerosene, gasoline, and on and on. The reality is that only contact cleaners should be used on contacts. Kinda what it was made for.

Now there are about a million people out there who will disagree with me and that's fine. We are each entitled to our own opinion. Just please don't tell some unsuspecting soul to use WD-40 on electrical contacts and switches. Keep using it yourself. You will as in a couple of months when it turns your switch into a dirt magnet you'll have to reapply. That's fine. But please don't suggest to others that they do the same.

Ok, my tirade is over... let the games begin...
 
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#2 ·
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I was once told that WD40 stands for "water displacement 40 days". This story says that it was developed by the military for distributor caps that sat for long periods of time unused. I do not know how true this is. I know of guys that think that it is the universal go-to for anything. Not me.



It is not a very good lubricant and not very good at loosening rusted or corroded fasteners. IMHO.
 
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#9 ·
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WD40 will clean a badly corroded or oxidized contact much quicker and better than regular contact cleaner which is far to gentle to clean up a really dirty contact efficiently.

However it does leave behind a sticky goo that will tend to collect dirt.

The best solution os to use the WD40 to get the contact clean and to check it out over the next few days to be sure a second cleaning is not needed (it has on two occasions for me) then follow up with the more expensive contact cleaner within the week to wash out the remaining WD40 and residue leaving you with clean contacts that will last longer.
 
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#10 ·
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I've always used WD-40 for cleaning electrical connections with never a problem.

At 12-14V DC, it's harmless electrically.

Dirt/dust/grime will collect no matter what is used or not used.

"Water Displacement - Formula 40" as I know it. WWII aluminum aircraft skin protectant.
 
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#12 ·
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Don't know, but must've been better than Formula 30... :D
 
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#14 ·
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You should see what WD-40 will do to the lockwork on a revolver. We had a standing rule. If the owner used WD-40 on it, we would not accept it as a trade in at any price.
 
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#16 ·
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Rudy wrote:
You should see what WD-40 will do to the lockwork on a revolver. We had a standing rule. If the owner used WD-40 on it, we would not accept it as a trade in at any price.
What does it do?
 
#17 ·
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Someone sent me a long list of things that WD-40 is good for, I'll find it and post it if no one else does.....I may stand corrected on this but ....Yes WD-40 does stand for "water displacement" 40th formula...It was made for Convair company to keep the outer skins of the Atlas Missiles from rusting.......The employees of that small plant started taking small bottles home with them, actually stealing it....In 1958 WD-40 was marketed to the general public....

It has never been patented or patent applied for....Reason for that is if you patent any thing, you must tell how you made it, plus ingredients it contains....The name WD-40 has been registered as a "Trademark" therefore no one can legally use that name......Same with Coke.....Here is a bit more information on WD-40.....

http://en.wikipedia.org/wiki/WD-40

Now from practical experiences with WD-40 I have learned the hard way not to use it on electrical blower motors....:shock: We had a sweet running little Dodge Challenger, it was a freebie, with body and front end damage...$250.00 later it was on the road....Got great gas mileage, had an A/C system that would freeze you out of it....One year we went to the panhandle, riding in comfort, had no idea of just how hot it was outside till we stopped at a National Park...Got out and nearly passed out..In the car it said it was 65 degrees, outside it was 114 in the shade, and there was no shade!!!!!

OK the A/C blower motor got to making a grinding noise...I got in the floor board removed the vent tube, I could see the brushes...OH Yeah baby we home free...I got my trusty can of WD-40, gave the brushes and bearing a little shot...reached up turned the key on, turned the blower motor on...Can you say Flames shooting out two foot right into your face??????...I had my glasses on which saved my eyes but my co-workers kidded me about not having eye brows for months.....One little spark, and had I not been wearing glasses, I might not be seeing too well now.....
 
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#22 ·
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Is it true that WD27 was later marketed as Diet Coke?;)
 
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#25 ·
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redbaron wrote:
...I got my trusty can of WD-40, gave the brushes and bearing a little shot...reached up turned the key on, turned the blower motor on...Can you say Flames shooting out two foot right into your face??????...

I'd blame that on the propellant in the can . Fumes then trapped in electric motor -spark -kaboom. Glad you didnt have any serious injury.
 
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