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It depends on too many variables to guess. Is the hull currently painted with anti-fouling paint? If so the cost should be minimal. If not I'd guess three times the cost of an already painted boat. Applying another anti fouling paint coat or two to a 15 footer is a pretty simple job easily done by most owners. I recommend Petit Hydrocoat or the West Marine equivalent.

For new anti-fouling paint the bottom has to be sanded so paint will hold to the surface. Boston Whaler recommends an epoxy barrier coat be applied before anti-fouling paint to protect the bottom from osmotic damage. Thus the extra cost.

If your boat is not yet painted why do you want to paint it?