WD-40
Dubblyew Dee Forty, do you know what it stands for?
It means: Water Dispersant, 40 days.
The following appeared in the June 1995 edition of GASIL, the General Aviation Safety Information Leaflet published for guidance of the operators of light aircraft:
The use of WD40
GASIL noted in an American magazine the statement that the much used WD40 should never be applied on aircraft.
The explanation given in the magazine for this is as follows.
"The brand name WD40 actually stands for 'water displacement' and '40 days'. The problem is that after a month or so WD40 dries into a sticky film that actually absorbs water and promotes corrosion."
It adds the CAA comment: 'It must not be forgotten that grease is hygroscopic (it absorbs water)'
So now you know.
Mind, it's still true that you can fix most things with a Mole Wrench and a can of WD40!
John
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Johnef
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