Thoroughly wash the pork shoulder in cold water and pat dry. Cover the entire shoulder with a thin layer of the Old South State Paint using a basting brush. Coat the pork shoulder with the Pantherfanz Red-Zone Dry Rub. Refrigerate for 24 hours.
Prepare smoker; heat to 300 degrees F. Place the pork shoulder in the smoker. Place a cast iron skillet underneath the pork filled 3/4 of the way with flat beer. Add more beer as it evaporates. Cook for about 2 hours.
When the internal temperature of the pork reaches 150 degrees F, reduce the temperature of the smoker to 225 degrees F and cook for an additional 3 hours. When the internal temperature of the pork reaches 175 degrees F, reduce the temperature of the smoker to 210 degrees F, and continue to cook the pork until it reaches an internal temperature of 190 degrees F. Serve with Carolina Border BBQ Sauce. Total cooking time averages 30 minutes a pound.