Given that the
work is 90% prep (cleaning,
sanding, fairing, solvent
washing, taping, priming,
sanding, etc.) cost is largely a function of the condition of the
hull. Dark colors can be more expensive as they show flaws and orange peel much more than lighter colors.
I’d say a full professional good quality spray job in the US will start at $15k. You can probably get it cheaper overseas as labor is the primary cost.