WD-40: Where not to use the popular spray

WD-40 is a globally recognized multi-purpose spray, a staple in workshops and garages for decades, known for its ability to loosen rusted bolts, eliminate squeaks, and protect against corrosion. Users have attributed over 2,000 potential applications to the product. However, experts caution that its use is not universally suitable and can lead to common mistakes.

A frequent error is using WD-40 as a permanent lubricant for items like bicycle chains or hinges. While it may temporarily reduce friction, its primary function is as a cleaner and penetrant that removes old grease, not providing lasting lubrication. The manufacturer advises applying a specialized lubricant after cleaning for durable results.

Particular care is needed with plastics and rubber. WD-40 is mainly intended for metal surfaces; prolonged contact with certain plastics, like clear polycarbonate and polystyrene, can cause cracks or damage. Some rubber seals may also swell after exposure. The manufacturer explicitly advises against using it to remove limescale from toilet bowls due to environmental concerns about its oil-based ingredients potentially polluting water systems.

When using WD-40 on electrical devices, ensure the appliance is unplugged to prevent ignition risks from aerosol sparks. Ventilate the area well before reconnecting to power. While it can help remove chewing gum from carpets, there's a risk of permanent stains or color changes, so testing on a hidden spot is recommended. Similarly, painted surfaces and wax coatings can be damaged by the spray's components. Experts emphasize that despite its versatility, WD-40 is not a universal solution, and users should consult manufacturer recommendations for intended uses.

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