No doubt the old DP was top shelf, but have no fear! The aviation industry still uses the "older" systems due to their superior performance and they are easily obtained from suppliers like aircraft spruce. They are made by companies like Stits, and PTI, Randolph etc. Downside to them is they dont contain talc like the DP primers had, so they are more sensitive to topcoat windows and may require scuffing. As an added benefit many of the aviation primers are tinted to look like a "zinc chromate" 1k primer, so it fits in for our vintage cars if there is some primer exposed on an interior section.