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I love WD-40. My grandpa would spray it on his feet and ankles periodically to loosen them up. He swore it worked! That aside, it will do well to clean metal up, but it is not a rust inhibitor and will do nothing to prevent corrosion. Many a garage engine builder has discovered that the WD-40 he sprayed and wiped his cylinder bores down with to keep them clean did preserve them as he though ti would when he returned some time later and found rust scaling up. WD-40 is a very SHORT TERM solution. It displaces water, and guess what, that water very likely ends up somewhere else on the firearm.
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