I would caution on the Plasti-dip. If you get fisheyes in it you will never get it out.
You are much better off with a satin black paint as Marlin suggested.
On the side of tbe car UNDER the black, you can use 3M Rocmer Shoots. It goes on thick and is usually left a little bumpy, then painted right over. The idea is that it lrotects the body from stone chips.
Lots of new cars have used it. Porsche, Datsun for a couple.
On the black you can actually get the flat black used on the hood of the 69 Boss 3p2 Mustang it spray cans from Classic Mustang vendors, mask the car off and do it yourself.
Just a thought.
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