ya get 6 maybe even 8 cans to play it out safe
then you can have extra for touch up’s later if you have some left over
primer is not always neccesary if you give the car a decent sanding.
start with 200 grit to rough it up, then a 400 grit to smooth it out and away you go with painting your car black. should last a while though as we have done this to a few cars for a local friend and it always works out good.
ps don’t buy that 2 dollar paint it does not cover at all.