i bought the aerosol kit when I did it, 4 oz of finish did a lot more than i figured.. removal of all oil before spraying seems to be the biggest thing. My Kahr had 2 little places that flaked, and with where it is I'm convinced its was from not removing all the oil.. I did an old .22 rifle, a savage muzzleloader, and an Ak, and they all look great.. mask off anything you dont want finish on, several thin coats,be careful of letting it run, if you can krylon something, you can do duracoat.