This is what I used to make my 72 concourse correct . Hope it helps
New Paint Methods for getting the correct Hood, Engine Compartment and lower blackout
Mustang Expert and owner of Mustang Central, Allan Shepley, has generously provided the 429 Megasite with the below information on achieving the correct appearance for our 71 Mustang hoods, lower blackout and underhood black using currently available products. Prior to Allan's help, people had to come up with something themselves since the old DDL-9423 is either unavailable (or very hard to find). Thanks Allan!!
John Blair ~ 429 Megasite Webmaster
I build Mustangs for a living and struggled for a long time to find the best paint for hoods and engine compartments as well as the lower black out area. The biggest problem you have with semi-gloss black with new paints, not lacquer, is getting an even finish. Most of them look splotchy or too flat or too glossy. The problem with most is you add a flattener to your clear, but the results are very inconsistent. I finally found PPG's DCU 2060 it is a premixed clear that already has the perfect mix. All you add is the hardener DCX61 and reducer DT 885. The ratio is 6 parts DCU 2060, 1 part DCX61, and 1 Part DT885. You use your black paint of choice IE. Dupont, PPG, R&M, whatever you like and topcoat with the PPG DCU 2060. Apply two wet coats and when its fully dried you have the perfect finish. Not only does it look good but it also is very stain resistant, you can wax it if you like it will not make it look powdery. Its great in the engine compartment for a fantastic look and a tough durable and easy to clean surface. I better quit I'm sounding like a commercial.
Allan
Mustang Central