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I use WD40 for long time storage of guns. The solvent in WD40 evaporates and leaves a varnish behind. This varnish seals the gun from moisture. The varnish will also lock the gun so it will no longer operate. To restore the gun, just spray with fresh WD40 and that will dissolve the varnish. I went overseas for 7.5 years and protected my guns this way. When I returned, the guns were just as I left them.
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