ORIGINAL: opjose
Sorry that is quite incorrect.
WD-40 - IS - a lubricant... It is a VERY effective one too... It is oil based.
It may loosen rust, and it can be used to flush any rust loose followed by a liberal rinse with either more WD-40 or glow fuel.
If WD-40 loosens rust, so will glow fuel with the heat of operation under normal circumstances... and that being the case a good cleaning is in order anyway.
I've used WD-40 in several dozen engines to get siezed engines back into operation, as part of a complete cleaning.
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Better still apply Dawn Power Dissolver internally, flush with hot water, follow that with WD-40.
Clean the carb, re-assemble and fly.
I've salvaged dozens of absolutely black and siezed engines this way.
Myth: WD-40 Multi-Use Product is not really a lubricant.
Fact: While the “W-D” in WD-40 stands for Water Displacement, WD-40 Multi-Use Product is a unique, special blend of lubricants. The product’s formulation also contains anti-corrosion agents and ingredients for penetration, water displacement and soil removal.
From the ''horse's mouth''.
http://wd40.com/about-us/myths-legends-fun-facts/
It's a small point but I am sorry but you are NOT correct. WD 40 is not a lubricant, it is a combination of a lubricant, penetrant and a water displacement.
"A lubricant is a substance introduced to reduce friction between moving surfaces."
"Penetrating oil, also known as penetrating fluid, is very low-viscosity oil. It can be used to free rusted mechanical parts (such as nuts and bolts) so that they can be removed, because it can penetrate into the narrow space between the threads of two parts. It can also be used as a general-purpose lubricant, a cleaner, or a corrosion stopper. Using penetrating fluids as general-purpose lubricants is not advisable, because such oils are relatively volatile. As a result, much of the penetrating oil will evaporate in a short amount of time, leaving little residual lubricant.."
Now do we all use it as a lubricant, sure including myself, but when it comes to airplanes especially real aircraft WD 40 does not fall into the lubricant category and is not allowed to be used as a lubricant.
As far as the WD 40 web sight, really, it's a household product what do you really think they are going to say?
Enough said.