The simplest thing I have found that works well for inside stuff is future floor acrylic finish. It's thin enough to get down in the small places--dries quick and is easy to apply again if you want and you don't lose the forged look. Like all stuff used to finish or coat things you need to clean/degrease/de-scale before applying. Even over a light scaleing it holds up pretty good.
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Man's opinion is no substitute for the Word of GOD.
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