Posted Oct 5, 2020, 1:41 PM
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Registered User
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Join Date: Nov 2014
Posts: 10,626
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Actually even uncovered it would be fine. Surface rust has very negligible dimensional effects on a steel beam and covers the exterior in a rust layer that blocks oxidation and rusting of the steel beneath. Think of it like the white mold skin on brie which protects the cheese underneath.
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