paiting your car with cans will be expensive with cans you get say 300g for $15
thats premixed,
you buy paint as a concentrate then mix it with thinners
say 1 litre of paint is $40-50
then you mix it with say 3L-4L of thinners
then you get around 5L of mixed paint for about $75 (thinners are $25 for 4L)
for a full car pending on how many coats you did, you could do it with 2-5L of paint, i dare even say 1 if your cheap, but then again its ALOT of paint when you look at it,
i painted my rear bumper and my skirts with 1L and 4L of thinners, and still had 1L mixed left over, doing another coat soon tho,
with cans your looking at around $750 and alot of work because when they get near empty they spit
if you had spray gear your looking around $195 for materials cost
then $50 for the gun and tank, and get a super crap compressor for like $75-100, dont expect it to last for ever but it'd do the job
so it'd cost $320-345 and you'd have spray gear,
or even borrow someones spray gear, thats what i did
you'll get MUCH better quallity out of a proper gun
yeah hope that helps, spraying is a fiddley thing