Sand you jeep down with a palm sander and make sure you get everything off, almost right down to the metal. Then take a grinder and get rid of all the rust. Next prime it with spray bomb primer. Then spraypaint the vehical. Small evenly spaces strokes, light coats, do 4 or 5 of them. thats one route. Or the other is do all the priming and then just paint it so it looks decent and when your out 4byin, you can get it scratched up and not care and cover up the scratehes with the extra spray paint can you keep in your consol