WD-40 can be used as an insulator for electrical circuits (with a dielectric strength of 35KV), but its primary functions are dehumidification, cleaning, and rust prevention, and it is not specifically designed for electrical applications. The standard WD-40 formula leaves a film that may cause poor contact over time due to buildup, and its flammable properties pose safety risks when electrical equipment is powered. For precision electronic components, it is recommended to use WD-40 Specialist Contact Cleaner, a dedicated contact cleaner that leaves no residue and is non-conductive, effectively removing oxide layers and moisture. Note that all operations must be performed with the power off, and the equipment should only be re-energized after complete drying. Additionally, when inspecting vehicle battery terminals regularly, the small blue can of WD-40 can be used to remove oxides, but avoid contact with rubber seals and plastic parts as it may degrade these materials. Always follow the product instructions and ensure proper ventilation during use.
