Penetrating oils
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Frequently asked questions
How does penetrating oil differ from ordinary lubricant?
Penetrating oil has very low viscosity and surface tension, so it creeps into threads to loosen rust and cut friction for removal. The film it leaves is thin and partly evaporates, so it does not replace long-term oil or grease lubrication.
How do I use penetrating oil to free a rusted bolt?
Spray at the thread root, wait at least 10 to 15 minutes, and for heavy rust reapply several times or leave overnight. Tapping the bolt head helps the oil work in. Turn slightly in the tightening direction first, then loosen, to break the rust.
Can penetrating oil be used near electrics or heat?
Most aerosols contain flammable solvents and propellant, so do not use them near flames, welding or hot surfaces, and isolate power before spraying electrical equipment. Also check compatibility with nearby rubber and plastics.
Is anything needed after the part is free?
Wipe off the penetrating oil, clean the threads and apply anti-seize compound or a preservative oil before reassembly. Residual penetrating oil skews tightening torque, because lubricated threads differ from dry torque values.
Can penetrating oil serve as a long-term lubricant?
It should not. A penetrating oil film is thin and its solvent evaporates quickly, so protection lasts only a short time. For hinges, chains or plain bearings that need lasting lubrication, use the correct oil or grease after cleaning.
Can penetrating oil damage rubber or plastics?
Some products contain strong solvents that swell rubber or cause stress cracking in plastics, especially polycarbonate and ABS. Before spraying near seals, hoses or plastic housings, test on a hidden spot or mask the area. Check the product safety data sheet for its solvent content.
Can penetrating oil protect parts against rust in storage?
Only for a very short time, from a few days to a few weeks indoors. For longer storage of machine parts, use a dedicated rust preventive that leaves a waxy or thick oil film, combined with corrosion inhibiting wrap. Humid conditions such as Vietnam's make thin films lose effect sooner.
How should penetrating oil aerosols be stored?
Aerosols are pressurised and must be kept in a cool, ventilated place below about 50 °C, away from direct sun and heat sources. Do not leave them in vehicle cabs or near ovens, and never puncture or burn a can even when empty. When storing many cans, keep them in a flammables cabinet according to the plant's safety rules.
