Double boil method for melting the chocolate.
I'd start out with 1/2 to1 teaspoon finely grated paraffin wax per package of chocolate.
Depending on how hard you want the coating to be, add just a little more.
I drip some of the chocolate on a piece of waxed paper.
This site recommends that you use Confectionery coating
Creating Chocolates - Kitchen Krafts