Automotive laquer based paints...but VERY expensive.
Best advice...pick up a few differnt cans of chrome spray paint from different manufactures as well as gloss or semigloss top caot sealer. Spray them on some test pieces. That's how I did my original JF costume for Dragon*con...
just keep spraying differnt paints until you find the one that looks right to you. Air burshing works best but if you have neither the equipment nor experience using one...just go with spray paint...
Most important...alllow paint to dry THOROUGHLY between coats. 
Good luck, 
Neil