During a cold snap, when temperatures dropped below freezing, the deadbolt to my garage froze and the key wouldn’t turn. I was renting at the time so I called the property maintenance company who told me to use a hair dryer to unfreeze the lock, so I could get to work. Then the person added “I’ll send someone out to spray it with WD-40.”
Being in the hardware business we hear and learn new things every day. One of the things I learn early on is while WD-40 is good for a lot of uses, it isn’t good to spray in locks.
Our Director of Engineering, Mark McRae, wrote a White Paper on the subject, which we have shared below. There is a lot of good technical information but basically our Director of Engineering recommends using White Lithium Grease for hinges, locks, and other door hardware.
The WD-40 vs White Lithium Grease vs Silicon Spray by Mark McRae
From getting loose a stuck bolt to lubricating metal to metal and metal to non-metal friction areas.
There are a lot of oils/lubricants/greases available for specific purposes and some that will work for a wide range of applications.
Below is information on WD-40, Silicon Spray and White Lithium Grease as they are by far the most popular “multipurpose” lubricant/greases.
WD-40 (Water Displacement, 40th attempt) is a product that everyone uses indiscriminately on a wide range of materials.