Pour a manageable amount of paint into a small container you can hold in one hand. Paint the edge of the floor along the perimeter of the whole room, using a 2-1/2-in. angled paintbrush.

You can use a masonry sealer like MasonryDefender Interior/Exterior ... of primer such as Behr Concrete and Masonry Bonding Primer to the floor to prepare it for painting. Primer helps the paint ...