According to Lawrence DelGrego, whom I discussed this with when I was considering coating the case colors on my 16VH that he had just reconditioned, Parker did not coat their case colors when they left the factory. When case colors were coated,(by owners) it was usually with a shellac and this made the frames susceptible to capturing water underneath the coating which led to rust buildup. So the coating of case colors is a practice to be discouraged.
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