Repainting a concrete floor-help?

I just finished painting my porch last weekend. i just got a flat shovel and began scraping. the actually make a scr for doing such a task then i scrubbed the floor with bleach, water and a drop of laundry soap then moped a couple times with clean water. let dry. then just rolled on a gallon of battleship grey cement paint from walmart saved a little bit for a couple ares that need a second coat. luv it ! 1 galon 250 sq feet ( use all tools and rollers with long handles)