WD-40 is an extremely popular product for quick degreasing, lubrication and corrosion protection, but there are many tasks where its use is not recommended. In this article, we reveal the most common mistakes and explain why in certain cases it is better to choose a specialized product. You have always been using WD-40 wrong!
WD-40 (Water Displacement, 40th attempt) has been one of the most widely used household tools for more than six decades. Its unique blend of solvents, lubricants and anti-corrosion additives allows for quick solutions to problems such as rusted screws, creaky doors or damp electrical contacts. But because WD-40 is significantly thinner than dedicated oils or greases, it is not only suboptimal in certain situations, but can also cause long-term damage. WD-40 You've always been using it wrong! Below are the main areas where it's better to leave it aside.
1. Long-term lubrication of hinges and gears
Although WD-40 temporarily eliminates squeaking door hinges, does not provide enough lubrication for long-term smooth operation. Due to its low viscosity, it evaporates quickly or is washed away from the lubricated surface together with dirt, which can cause faster wear of metal contacts. Instead, we recommend using white lithium grease or synthetic oils with high viscosity. Sure: You've always been using WD-40 wrong.
2. Lubricating the bicycle chains
Standard WD-40 works as an effective degreaser, but not as a long-term lubricant. After degreasing the chain, use a dedicated bicycle oil that contains additives to resist dust and water and provide protection at high RPM loads.
3. Electrical contacts and bearings
WD-40 displaces moisture and temporarily improves conductivity, but it also removes the intended lubricants on bearing rings or contact surfaces. In the long run, this leads to increased wear and overheating. For electrical contacts, use a cleaner with lubricating additives specifically designed for electronics.
4. Plastic surfaces, especially polycarbonate and polystyrene
The solvents in WD-40 can cause discoloration, cracking, or loss of gloss on sensitive surfaces. Avoid using on clear plastic parts such as lamp lenses, protective covers, and condensation collectors.
5. Rubber sealing rings and profiles
Short-term soaping can cause rubber seals to swell and eventually become brittle. To maintain elasticity and tightness, use silicone or graphite aerosols that do not degrease the rubber.
6. Painted and varnished surfaces
The solvents in WD-40 dissolve some types of paints and protective varnishes, which can appear as a hazy or fluffy residue on the treated surface. When removing stains from wood or metal furniture surfaces, use a mild soap solution or a cleaner specifically designed for painted materials.
7. Locking mechanisms
WD-40 temporarily removes stuck particles, but over time it attracts dust and dirt, which can make locked mechanisms (e.g. locks) even harder to operate. A better choice is to use graphite powder or special lock lubricants that do not attract dust.
8. Long-term rust protection on tools
Although WD-40 provides short-term protection against moisture, it will eventually evaporate, leaving the metal exposed. For permanent corrosion protection, use oils with rust inhibitors or special coatings that stay on the surface for months.
9. Adding WD-40 to Fuel
Myths and truth
Many people believe that WD-40 “absorbs” water in the tank and prevents rust and engine malfunctions. The recommended “dose” is about 30 ml of WD-40 for every 4.5 l of gasoline (1 fl oz per gallon), but this is not safe or sensible.
Why is it undesirable?
- Damage to the fuel supply system and catalytic converter: During combustion, the solvents and minerals from WD-40 do not burn completely, so they accumulate in pipes, injectors and the catalytic converter, which can lead to expensive repairs.
- Unbalanced combustion mixture: Foreign vapors change the air-fuel ratio, which means loss of power, uneven operation and higher consumption.
- Risk of spontaneous combustion: Due to the easier flammability of WD-40, unexpected ignitions or overheating may occur in the tank.
Recommended solution
To remove water from fuel, use specialized alcohol (methanol) or glycerin-based additives tested for safe use in engines. Do not use WD-40 as an additive.
Conclusion: You've Always Been Using WD-40 Wrong
WD-40 remains an indispensable assistant for quick repairs and protection against moisture, but it is not a universal solution. Before each use, think about whether you need a dedicated lubricant, cleaner or coating? The right choice will ensure optimal performance and a long service life of your devices and tools.
