with a proper spray gun and compressor, hire one if you havent got one. get acrylic base coat with ISO FREE 2 pack clear youll be laughing.
Most good auto shops mix paint these days but if you can find one, a specialist auto paint supplies shop might be better.
Ok cool So I have a 2008 calais phantom black Do I need to get any particular part like with a gloss?
i got mine from http://www.autonindustry.com.au/ and got it sent to me as nowhere in cairns could supply what i wanted ISO free. phone them ask them and youll be good to go. i got a few litres of acrylic phantom black and 4 litres of ISO Free 2 pack clear, same will go over your sanded painted surface not down to metal.
No way use 280, you will be forever sanding out the scratches. 600 wet and dry and then 800 before primer.