You are thinking about plati-dip in aerosal cans, they sell it in straight gallon containers that you apply with a normal spray gun like automotive paint. Starts around 70$ a gallon, and you can have metallic, flat, pearlescent, etc. Even custom colors mixed all yourself.
My friend did his Miata with 3 gallons. Full car 4 coats, plus 4 additional coats to the front for 8 total.
Its AWESOME stuff.
https://www.dipyourcar.com/