WD40 contains petroleum oil:
http://www.wd40company.com/files/pdf/msds-wd494716385.pdf
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Loosening Rusted Hardware
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 12 Apr 2015 19:29:05 -0400
I've often wondered why WD40 became associated with a rust buster/penetrate.
It does penetrate, but contains no lubricant and evaporates relatively quick
leaving thing as they were before the application. However, it is good for
freeing up small engines that have seized. Pull the plug, squirt in about a
tablespoons worth and let set over night.
Bur, rusted bolts, not so much.
73
Roger (K8RI)
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