Penetration It is important to distinguish between lubrication and penetration. The core mechanism relies on capillary action, where the fluid seeps into microscopic gaps between tightly fitted components.
How WD-40 Penetrating Oil Achieves Surface Slick Coverage and Deep Penetration
The solvents in WD-40 evaporate relatively quickly, leaving behind the lubricants, which means the mixture does not stay in the micro-gaps long enough to exert the sustained pressure required to break heavy rust bonds. It creates a protective barrier that reduces friction and repels dirt.
To be effective, these oils must have extremely low viscosity and a high level of fluidity, allowing them to wick into the narrow spaces that conventional lubricants cannot reach. When people reach for a can of WD-40, they are often seeking a solution for a stubborn squeak or a rusty bolt.
How WD-40 Penetrating Oil Achieves Surface Slick Coverage Through Capillary Action
Penetrating oils, conversely, are meant to be absorbed and to soak into static, non-moving parts. However, this is not the same as the deep-penetrating action of a dedicated product like PB Blaster or Liquid Wrench.
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