Used Equipment

Does WD40 cause metal to rust? Also does it damage rubber washers / o-rings / seals?

I sprayed some on a metal car mechanism in the engine bay, thinking it would protect it from water… but that copper/yellow metal bit has now got a thin coating of rust on it within the space of a couple of months.

Also I got some on some rubber seals… like those big rubber things which sort of go over the inner axel, and I’m now worried the WD40 might rot it?
Some very good answers and gems of info – thanks.

I think perhaps the part i sprayed had a film of protective grease on it already and the WD-40 has removed it and attracted dirt (quite a bit) and caused the surface rust.
smooth, that’s the first time I’ve heard of silicone lubricant damaging rubber. In fact I was specifically advised on a car forum by a number of people to use silicone spray lubricant on my rubber front door window runners… as they were stiff and stopping/friction the electric window rising up fluently.

WD-40 is a water displacer, thus “WD”. Some people think WD-40 is a penetrating oil for loosening bolts, I’m not one of them. (I think Liquid Wrench is a good penetrating oil, and Kroil is a superb one, if you can get it.)

I think WD-40 could damage rubber, but your CV-joint boots will probably be fine since they are a) synthetic rubber, b) designed to be exposed to lubricants and solvents, and c) exposed to the elements, which have probably washed off the WD-40 by now.

If you want to protect something from water and rust, then prep it, prime it and paint it. WD-40 or penetrating oil isn’t for that. If anything, they’ll wash away thicker oils or waxes that might protect it better.

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