I haven't added anything to the chocolate ... I just melt some chipits and dip away. What I like best is to only dip 1/2 the pretzel, and the other 1/2 is left plain! I think the best thing is to not melt a lot at a time
The other option ... melt in a double boiler, and keep the pot on low as you do your dipping.
Set each pretzel on a waxed paper.
Love the combo of the crunch, salt and chocolate!