The surface material also plays a role; a porous surface like wood will absorb the oils, while a smooth metal surface will allow the solvents to rise and vanish rapidly. The Role of Evaporation These volatile solvents are engineered to evaporate quickly when exposed to air.
WD-40 Protects After Evaporation: How Lubrication Remains
As the thin solvents dissipate into the atmosphere, they leave behind the thicker oils and waxes that do the actual lubricating work. This fluid is blended with various other oils and waxes to provide long-term lubrication.
WD-40 is a ubiquitous presence in garages and toolboxes worldwide, often sprayed liberally onto rusty bolts and squeaking hinges. When you spray WD-40, you are primarily applying a mixture of these fast-acting solvents and the slower-working oils.
WD-40 Protects After Evaporation — How the Remaining Oils Continue to Guard Your Tools
Their primary job is to carry the heavier lubricating oils into the tiny crevices of a mechanism, such as the threads of a rusted screw. Conversely, applying a thick coat in a humid or stagnant environment will significantly slow the process.
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