I always use the Automotive grade paint just as Kengore says and I dip in a mixture of varnish as well..gives it a bit more resiliency. Most Automotive paint supply stores can now mix any color that you want and put it in a spray can too, but that can be a bit pricey. Be overly cautious about getting the paint too thick, do as Kengore says and apply light covering coats until you get the desired depth of color.