'twer me, I'd put in something that I knew would protect the firearms first, and then use a separate product to reduce corrosion.
My safe is lined with GI sleeping pad foam, cut to shape, and I use Eezox for corrosion protection.
Mechanics handle their tools with oily hands, to fix oily things in an oily environment. VCI materials may work, but you'd never be able to prove their worth in a gun safe.
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