1) Nobody outside of the manufacturer knows what's in WD40. Try getting an MSDS (Material Safety Data Sheet) from them - they won't issue one. I tried and failed to get it approved for use in a Ford Motor Company plant because I couldn't get an MSDS.
2) WD40 left a coat of varnish on the barrel of a muzzleloader of mine. It took some pretty good solvent to remove it.
3) WD40 will temporarily disable primers, but the primers will reactivate after the WD40 evaporates.
4) I won't use it to clean or lubricate guns. There are better products available for both purposes.
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Last edited by enfield; 03-22-2010 at 09:10 AM.
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