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- Sep 29, 2008
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WD-40 was designed as an anti icing agent and a cleaner (NASA) NOT as a lubircant, and it WILL evaporate in short order leaving a sticky/gum varnish. Instead use any quality gun oil as they are designed for the close tollerances and engineered not to evaporate or turn to a gum or varnish.
Actually it was developed to displace water.

Also, it is a lubricant.
The long term active ingredient is a non-volatile, viscous oil which remains on the surface, providing lubrication and protection from moisture. This is diluted with a volatile hydrocarbon to give a low viscosity fluid which can be sprayed and thus get into crevices. The volatile hydrocarbon then evaporates, leaving the oil behind. A propellant (originally a low-molecular weight hydrocarbon, now carbon dioxide) provides gas pressure in the can to force the liquid through the spray nozzle, then itself diffuses away.
These properties make the product useful in both home and commercial fields; lubricating and loosening joints and hinges, removing dirt and residue, extricating stuck screws and bolts, and preventing rust are common usages.
I don't know what the big fuss is. It's a fine cleaner too. Spray it in, open and close the knife a bit, use some compressed air to blow it out or let it dry. It takes all the dirt and grime with it leaving you with a clean pivot. If you (like me) don't prefer oiling pivots, a clean one is the next best thing.