Without knowing the year, make and model of your car we have no clue what type of paint was used by the manufacturer. Take your paint code to the largest automotive paint shop you can find. They will mix the correct color for you.
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On the exterior? Probably not. Acrylic is water-based and will be affected by humidity, and may even come off in a heavy rainstorm. You would want to use an enamel paint for outdoor use. Spray enamels like Krylon can be used and if you want to brush it on, simply spray some paint into the cap (or other container) until it pools up a bit and gives you a liquid puddle to dip your brush into.
