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I will not use WD40 except as short term protection/lubrication, or maybe as lubricant on drill bits when attacking tough steel. I have seen no evidence of it degrading steel, but it gums up over time and can cause delicate assemblies to stick and malfunction. I have seen it first hand. It is also a very poor penetrating oil compared to others, especially Kroil. It is useful for removing bug and tar goop from your car. Almost any other product is better for the primary uses. Another real standout is Ballistol, which is pricy, but is so useful for so many tasks that it is well worth it. If you like "good enough", by all means carry on. But over the last 40+ years of working with such products I have found it to be inferior. I will never buy it again if there is an alternative.
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