30+ years ago when i built my railroad without the benefit of the info provided by this forum and the internet, i stumbled on a product called Homabed. I used it on whatever wood for benchwork was beneath it. For large flat areas like yards and hidden turning loops I used sheets of Homasote. After laying it down i painted it with gray latex paint, followed by trackwork and ballasting. It is in a basement here in the northeast and has served me well.
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