.............WD40?

I just saw an interesting TV bit on how WD40 was developed.

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The Story
"WD-40, everyone's favorite lubricant, came into being in 1953 at San
Diego's Rocket Chemical Company, when rocket scientist Norm Larson strove to
create a degreaser and solvent that would guard the rockets of America's
budding space program from rust and corrosion. Larson tried 39 different
combinations of chemicals before stumbling upon the one that would later
become WD-40, an abbreviation signifying the 40th combination of water
displacement. "

http://travel.discovery.com/fansites...oods/wd40.html
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WD40 has become a versatile fluid for lubrication, cleaning and water
proofing. This site gives 2000 uses for it. http://www.twbc.org/wd40.htm

How do you use it on the boat?