So I have begun the process of spraying my ICS m4 as I have been to a few skirmishs and no longer need it to have the blue rail I have bought some krylon fusion black which is on its way the only part of my m4 that is blue is the front rail system so I took it off and intend to spray it black when the paint gets here, I just want to know, should I buy a matte clear spray as well to go over the top of it or will it be ok with 3-4 coats of black??