The other SPI option is SPI 2201 Single stage matte black. It is durable and versitle in that you can vary the amount of gloss by how much activator you use. This is from the SPI Tech manual:
With a 4:1 mix you will end up with an egg
shell finish with 3-5% gloss. With a 6:1 mix you will have a nice flat black with about 1% gloss
(this is the most popular choice). With 8:1 mix you will have black with zero shine leaning to a
slight gray scale but its only noticeable if painted on a panel next to the other mix ratios of Matte
Black. SPRAY TEST PANELS FIRST so you choose the right mixing ratio for your application.
Very versatile product when you need to duplicate a certain gloss level.