Hey guys, I'm hoping to pick your brains and see if you could think of what our issue could possibly be? We built a new shop about 2.5 years ago its a 4k sqft open cell insulated building its pretty much air tight. We had zero issues with rust in the building for about the first year and a half now it seems that everything in here is rusting. Even some aluminum is corroding and leaving a dust on the surface. We haven't changed anything since we moved in, the first year we had a warm humid...
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