Q: WD-40 shouldn't be used in door locks or ignition locks. It dries out and turns to goo, which can cause the tumblers to stick. It was initially meant as a de-rusting spray and general-purpose lubricant (say, door hinges).

Can you use WD40 on a frozen lock?

You can use WD-40 Multi-Use, as one of its uses, WD-40 Multi-Use can stop locks from freezing with its unique formula. ... You may know WD-40 as your go-to lubricant but it can be also used to displace water, effectively preventing water from pooling or standing on a surface.

Why you shouldn't use WD40 on locks?

But this multi-faceted product has limitations – it should never be used to lubricate locks! The main reason for this is that WD40 is not a true lubricant; it is a water and oil displacing solvent. ... As well as this, using WD40 in a lock can lead to the collection of dust and grime, causing the lock pins to stick.