Black out NFab and TRD Skid plates

Couldnt find anything on here about what people have used to black out their skid plates on their aftermarket/stock bumpers. Ive used plasti-dip in the past and it has worked well but never had to worry about scratching it up and re applying a 2nd coat, but this is still my first option. I read somewhere people just use black spray can to paint their rock sliders or skids in the past but I forgot where i read it and what brand it was. Never did Line-X or anything like that but I really dont want to remove the skid plates off the truck id rather do it with it on and just spray something on but im open to other ideas, thank you all for your help!