Check out CRC corrosion inhibitor, available at marine stores, I use it on some of my undercarriage where rust is a problem.

 

What's in WD40?

 

50%: Stoddard solvent (i.e., mineral spirits -- primarily hexane, somewhat similar to kerosene)

25%: Liquefied petroleum gas (presumably as a propellant; carbon dioxide is now used instead to reduce WD-40's considerable flammability)

15+%: Mineral oil (light lubricating oil)

10-%: Inert ingredients

 

Does it hurt your paint, break down vinyl or rubber, can you still see out of your windshield?

I assume that since you have a Chevy you have to spray the whole thing inside and out to keep it from corroding.

 

no it doesnt hurt the paint or break down rubber

and wtf i dont spray it on my windshield.

 

Being a solvent, there are many manufacture protective coatings on plastic and rubber it will dissolve and remove.

Though it does initially displace water....Having oil in it makes it cause dust, dirt, salt and other bad things to cling to surfaces and accumulate in voids and once the dirt and dust cling long enough they attract and hold moisture which eventually promotes corrosion and microbiological attack.

For a while the Navy used it on electrical equipment but stopped quickly as it caused more corrosion than it prevented in salt environments.

 

yep there are always the doubters who say it causes more corrosion but i dont see how


rust needs moisture and air. if something has wd40 on it that rust cant form

it has mineral oil in it that leaves a residue.


straight from the wd40 can:

"for best rust protection spray on and do not wipe off"

 

Im not a doubter just giving chemistry and science facts...even the military stopped using it because dirt/salt and contaminants cling to it, hold moisture which sets up corrosion.

Rust is a general term for a series of iron oxides, usually red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture.

There are many types of Corrosion which is the wearing away of metals due to a chemical reaction.

A proper undercarriage corrosion inhibitor would be waterproof and dry hard.
Oil and water dont mix but water does cling to oil, degrade it and cause corrosion.

Do you think that if you poured a pint of water in your crank case nothing would rust because the oil waterproofed it?

I used to and still do have many bad habits...but I live and learn.

 

dang.

if i left two bare pieces of steel outside and soaked one in wd40 regularly and left the other one alone. which do you think is gunna show more rust?

 

The undercarrage of a vehicle is not a bare piece of steel. There are many coated parts, many voids and places you cant see or reach.

Lets say a piece of metal or rubber was coated with some sort of long term protectant and you removed the coating repeated use of the solvent in WD40. Would you be improving things or making a problem? What about trapped water mixed with oil in some dark wet hole that never sees light?

WD stands for water displacement not WR for water repellent or even water remover. The water gets displaced to somewhere else. Oil repels water but eventually water with it's contaminants (dirt, salt, microbes) degrade the oil.
If you mix WD40 with water it turns white like the oil in your crankcase when mixed with water. Trapped water will not evaporate because of the oil.

Bad habits die hard sometimes.

 

how about a truck that is 14 years old like mine (ive only owned it past 6 months) and has no coatings left.

will it do any harm?

 

Yes you would still be promoting a mix of dirt, salt, oil and water trapped in voids (cracks and crevices) which will eventually eat holes in things that would normally gradually and slowly just rust.
Maybe after washing and spraying you high pressure air blast the hard to reach voids may lessen problems but...
Salt is a very strong oxide. WD40 makes it cling like glue.

 

this is news to me. and i dont spray it on salt. if i have salt i wash that off first

what is an alternative that i could spray on the undercarriage? pam?


these people disagree

http://www.dodgetalk.com/forums/arch.../t-243049.html

http://www.toyota-4runner.org/detail...on-winter.html

 

only thing i spray it on is everything underneath the truck. Nothing on paint period for me

 

well yeah if it does get on the paint, i just make sure to wax it after.


and now this guy is telling us wd40 is bad to spray on the undercarriage. i dont know a lot of people do it and it has shown positive effects. i think we need to contact the wd40 company.