WD means Water Displacer and 40 was for the 40th attempt to get the
formula to perform and pass under military tests.


basskisser wrote:
Richard J Kinch wrote:
JimH writes:

Liquid Rollers...............It turns out to be a can of silicone with
some pretty nasty propellants and solvents.

Most so-called "silicone" sprays are just a few drops of actual silicone in
a bulk of mineral spirits.

No more true than your statement that WD-40 is Kerosene. See he
http://www.wd40.com/Brands/wd40_faqs.html

Which in part states:

What does WD-40 contain?
While the ingredients in WD-40 are secret, we can tell you what WD-40
does NOT contain. WD-40 does not contain silicone, kerosene, water,
wax, graphite, chlorofluorocarbons (CFCs), or any known cancer-causing
agents.