Originally posted by Mike Burch
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The assertions so far have been that an oak toolbox will rust what is in it, that varnish will have NO effect of preventing that, but, paradoxically, that a layer of extremely porous felt is a barrier to this rusting.
Datapoints: Nails in boats rust. Tools in oak toolboxes do NOT rust. Toolboxes commonly have felt on at least the bottom inside of drawers and other storage areas. And, that surface is commonly something other than the wood the case is made of, anyhow.
What is true of nails that s not true of tools? Nails are hammered into oak (or other wood) and contact it rather closely, while tools are only hammered into wood (oak or not) rather rarely.
So.... I put it to you that the function of felt is to prevent direct contact of tools with oak (or whatever the case is made of), and that the problem will only happen if there is water present to carry tannins to the steel/iron.
If that toolcase is modified with felt on the contact surfaces, there will be essentially no danger of rust from the oak, unless the mice decide to take that box for a sailing trip.
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