I have used both duracoat and cerakote systems. in my opinion cerakote is a superior product hands down. It goes on thinner and therefore is more chip/scratch resistant, as well as will not interfere with bolt movement in an action if you coat the inside of the action. This goes for both bolt action and semi auto. You have to use an air gun to apply as it is not available in a spray can like the duracoat. But its worth the investment if you are going to spend the time prepping, you may as well get the best result. Even the inexpensive detail guns available at harbor freight will turn out good results.