The last shop that I had with a wood floor in it, I used no.2 2-1/4" Oak flooring. I just left it unfinished. That was decades ago, but I'd do it again. It was cheap then, but I have no idea what it costs now. If it got scuffed up, I'd just run the flooring buffer over it with an 80 grit screen, and blow that dust out with the rest of it.
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