Flat paint maintenance

[raf40@oes.amdahl.com (Richard Funnell)]

My '83 urQ has a flat black finish on the panel between the rear window and
the wing, as well as on the vertical strips near the doors.  Is this
normal?  What is the best way to maintain it and return it to a deep black?
Also, does anyone know of a paint or other coating I can apply myself
which will stand up to use on the brake calipers?  TIA

Richard Funnell,
San Jose, California
'83 urQ
'87 560 SL