OK, I'll jump in, I recently painted the engine on my Z/28 project and used Seymour EN-48. My shop partner was convinced there was negligible difference between Dupli Color 1607 and Seymour so I did a spray out as shown in the photo below. They differ in both gloss and color. I find coverage is poor with Seymour and it can require multiple coats vs Dupli Color which provides excellent coverage. Over on CRG opinions differ but Seymour is preferred.
