When sourcing multi-purpose lubricants like WD-40, you must prioritize the 'Five Basic Functions': Lubrication (reducing friction), Penetration (loosening rusted parts), Cleaning (removing grease and grime), Moisture Displacement (drying out electrical systems), and Corrosion Protection (forming a protective barrier). Ensure the product features a high-quality CO2 propellant or specialized delivery systems like the 'Smart Straw' for precision application. For industrial use, verify the dielectric strength if the product will be used near electrical components to ensure safety.