Quite a few posts over the years about not using WD40 in locks, apparently it can set hard and stops the key going in.A couple of ours froze up last time we were away so when the sun got on and thawed them out I put a bit of WD40 in (they have a shield over the lock so you need the pipe) next morning -11 and all was OK.
People who used to work in the lock-making industry used to say "Never use oil to free-up a lock, use Graphite instead". I assume that oil encourages muck to stick in the mechanism and gum everything up.Quite a few posts over the years about not using WD40 in locks, apparently it can set hard and stops the key going in.
FunctionAbsolutely not, WD40 isn`t a lubricant.
An excellent detailed post, all I will add is during the winter months spray some WD-40 on the tools in your garage or workshop and see how long it takes for them to go rusty, then try some ACF 50 on them, they will never show any signs of rust.Function
The long-term active ingredient is a non-volatile viscous oil which remains on the surface to which it is applied, giving lubrication and protection from moisture. This oil is diluted with a volatile hydrocarbon to make a low viscosity fluid which can be aerosolized to penetrate crevices. The volatile hydrocarbon then evaporates, leaving behind the oil. A propellant (originally a low-molecular-weight hydrocarbon, now carbon dioxide) creates pressure in the can to force the liquid through the can's nozzle before evaporating.
Its properties make it useful in both domestic and commercial settings. Typical uses for WD-40 include removing dirt and extricating jammed screws and bolts. It can also be used to loosen stubborn zippers and displace moisture.
Due to its low viscosity, WD-40 is not always a suitable oil for certain tasks. Applications that require higher viscosity oils may use motor oils. Those requiring a mid-range oil could use honing oil.