Problem Drip: When you dip the rod, let the plastic run off. When it just about stops, turn the rod up with the head of the tube facing up. The drip will then run back down on the body of the tube.
Problem Thin walls: There are several variables here, how hot the plastic is, salt or other additives, what type of plastic you are using. I use LC 500 plastic and add about 1/4 cup of salt to cup of plastic. If you start dipping when the plastic is still real hot, you will get thin walls. Wait until it is too thick, and the walls will be real thick. If you start dipping and it is way too hot, you may have to add an additional dip.
Hope this helps.