Rolling paint onto the floor is the easiest part of the job. H&C Silicone Acrylic Concrete Sealer has performed well for me in the past, with no peeling or chipping. A $19 gallon of Dove gray-H&C's lightest gray color-recoated a single-car garage floor. Preparation involved scrubbing with a concrete cleaner, followed by a thorough rinsing, and then letting the floor dry for 24 hours. Warning: wear a carbon-filter mask during application as the fumes are intense.