While polished concrete floors may be all the rage inside modern homes, in the garage, there are plenty of reasons to cover them up, not least because they're an ergonomic nightmare for the home mechanic. Unsealed concrete floors can quickly absorb oil and chemical spills, and unless you've mastered the art of changing oil without spilling a drop, they can start to look a little Rorschach. Painted or sealed concrete floors are easier to clean, but they can be incredibly slick when wet or when regularly misted with bike-polish overspray. Over time, stationary motorcycle tires can even absorb moisture from concrete. So by protecting your floor, you're protecting your tires.