Buffing, compounding,??? Help

I sprayed 2 coats single stage, acrylic enamel, wet sanded with 800. That removed all orange peel and runs. Then sprayed 2 more coats, 1 medium coat, let flash then 1 full wet coat. The roof looks good but I can't get a good smooth finish on the vertical sides. I have plenty of sandpaper and sanding blocks. I got confused when looking at the different compounds and buffing pads. Also I don't know what I don't know about buffing and polishing.