Rustoleum
I'll be the first to admit there are better products, but I (as well as others on here) did just fine with rustoleum "hammered" finish. It comes in both rattle can and by the quart. I used the quart and an hvlp sprayer to do all the loose items of the cockpit such as floors and seats. I used a rattle can to do the insides of the fuselage (areas not covered by interior panels) and the tops of the canopy rails. Mostly silver. Panel and rails are a darker gray. All via Home Depot. It takes a long time to dry ice and hard though. You can probably see some photos in my build log, link below.