Depending how bad the orange peel is, you should be able to buff it out pretty good. I would suggest clear coating the parts with a 2 part clear for protection from gas, weather and scratches, rattle can paint doesnt have the hardener in it that a 2 part paint does and can be easily scratched by even a paper towel.
Like JRK, 2000 grit wet dry trigger spray bottle full of water....circular motion until it is smooth, I like the 3M 3 bart compunds...works good...you might go with the 2 lighter ones since you used 2000 grit...make sure you don't sand through the clear...bufff, bufff, buff,....