I recommend Duracoat. you could get away with krylon but Duracoat will hold up a lot better. The key to durability with any of it will be your prep work. He's right though, youll want to make some sort of stencil. I have done several of the "pinestraw" jobs. The trick to getting it to look right is all in how you layer your colors. Grab a 2x4 or something cheap to practice on. If you want a different type of camo youll need to make the stencils with masking tape and a knife, or buy them online. I created all mine on the computer and have a stencil cutter cut them for me. Ill sell em if your interested.
Montaktical MTAK Duracoat