In a circular motion, sand the surface to rough up the finish.
Apply liquid deglosser to a cloth and apply to the floor in a circular motion. Allow to dry 15 minutes.
Thoroughly clean floor using a degreaser until all residue has been removed. Allow it to dry completely.
Tape surrounding area.
Cut in by painting around the perimeter.
Pour paint on floor or apply to roller using a paint tray. Roll paint on the floor working your way out of the room. Resist the temptation to go over it more than once.
Allow it to dry 4 hours.
Apply second coat of paint again, not going over an area more than once.
Allow to dry.
Video
Notes
Tips
Choose high quality paint.
Thoroughly sand and clean surface.
Don't roll over the same spot twice for the smoothest finish.