If you do go with a coated or stained floor go with a really light color and it will lighten up the room. My first coating on the smaller shop was a dark blue urethane that failed right away due to the manufacturer mixing it wrong. That was lucky for me because the manufacturer paid the installing company to diamond grind it all off. The color was pretty but the room was really dark. Would have probably had to double the lights in there to get it back to normal.
There are a ton of them out there. There are also smaller ones you walk behind. Sprays soapy water on the floor, scrubs and then vacuums it up. Not dust like when you are sweeping.
Funny... a few years back I was visiting Reggie Jackson's
shop and he was mopping his floors ... 69 z28's
parked all over the place... he said the place was a mess
I guess he could have used one of Charlie's machines