if you are asking these questions, you should be asking yourself, "do i have the intelligence to do this?" it's simple man, take off anything that you should obviously not paint, like bushings, wheels(bearings in them), washers. apply paint, it could be fucking finger paint for christ sake, but spray paint would obviously be the most effective. tape off metal you don't want to paint. paint. allow a hefty time to dry (max on can at least, so it will decrease chances of peeling). reassemble. and ride. it probably will chip off eventually because it's a longboard though, and if you do it wrong it will look shitty. not worth it in my opinion. the gunmetal looks tight anyways (i imagine they are Paris or Randall's?)