Thanks. Been told some conflicting info. I was told that polished concrete isn't very stain/scratch resistant. I would assume a good sealant would provide protection against moisture (oy, the Gulf Coast humidity) and against all but the most caustic fluids. Think it looks great, and with the added benefits of not needing any other materials, I would imagine it's also very cost effective.
I would say stain resistant, but not scratch resistant. If you go with a fairly light color though, the scratches won't show up nearly as much. I do a fair amount of work in my lower level garage, plus pull my tracked vehicle in and out, moving snowplow around, snowmobiles and trailer (and put the hitch/jack down) etc, and the scratches really show up on my dark brown/orange color. However, cleaning spills/leaks of virtually any kind are a breeze to wipe up. Overall I love it, but if you plan to actually use the garage to do work, go with a lighter color. JMO...