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Forgot to mention that the parts are from the inner frame , some have a base coat others don`t

use a top coat over it i had the problem the first time so just get future pledge top coat that stuff is the greatest protection over ur kits

If you want to have the color stay matte/flat, you definitely shouldn’t use “Future Pledge” as this gives the paint a gloss coat. In other words, the flat black paint will turn into a gloss black.
If you used a enamel paint, let it cure for 3 to 4 days. Enamels take long to cure, but are very scratch resistant.
Lacquer paints are tough too and cure much faster, fully cures in 2 days.
If you used an acrylic paint, what my guess is, the best way to get it rather scratch resistant is to use a clear top coat. And if you want to contain the flat black, you should get a flat clear coat. And not to mention, an acrylic one.
You can spray an enamel or lacquer clear coat on top of acrylic, but you have to be very careful, the acrylic paint has to be fully cured, so give it a few days to be sure, then spray a fine mist of clear on it. Make sure you keep 12″ or 30 cm away from the object and spray with no more then 15psi/1Bar. Then 2 other coats misted really fine on the pieces in the same fashion. Allow to dry for approximately an hour between coats. The last coat may be a thick all covering coat. Please keep in mind, this will make the pieces a tad thicker then normal, so armor pieces may not fit that well and joints may become harder to move. You could mask the joints and use a hobby knife to carefully scrape away the paint in the crevasses which hold the armor parts.
Hope this is of some help. Good luck