this post was submitted on 29 Aug 2025
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Locksmiths hate WD-40
not a locksmith, but...
One of those candidates for 'worst memorable phrase in history' is the old "duct-tape for things that move and shouldn't and wd-40 for things that should move and don't".
WD-40 isn't a lubricant. It often works to get something un-stuck, but then you need to still clean and lubricate the parts to keep it working.
How do they feel about Ballistol?
Never heard of it, but I use Tri-flow and Houdini liberally. If Ballistol doesn't leave a residue it's probably fine
Well it's an oil that leaves a bit of a layer to protect metal against rust, so probably not lol.
Why this one?
IANAL, but people use it on squeaky hinges and knobs and locks, but it sits in the mechanism and collects dust. It turns into a gummy mess eventually, which is the last thing you would want in a lock.
You really shouldn't be using WD-40 for that.
IANALPL
That reminds me, I haven't watched one of his videos in a while.
This is it ☝️
I imagine it gunks up the lock mechanism. I have had to eventually replace locks I used it in.