Quote:
Originally Posted by finsruskw
If WD-40 is no good as a lube as some of you claim, then why does it work so well as a lube for milling aluminum?
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The way I see it, WD40 isn't a penetrating oil, so it won't be effective at eating away rust like actual penetrating oil. However, it'll work just fine as a lubricant as long as the part your lubricating isn't stuck.
Essentially you need a penetrating oil to remove initial rust and free up whatever is frozen, but once it's no longer frozen you don't need the penetrating oil to keep it unfrozen. At that point WD40 will work just fine.
I use it all the time in this way and haven't had an issue.
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