Use a high quality clear coat for the final finish. Whether its flat, semi-gloss or gloss the final coat should be durable enough to protect the part. Once the clear coat has dried you need to inspect it for defects. Most minor defects like orange peel look, or debris in the finish can be wet sanded and polished out at this stage. There are a few exceptions to this. For instance if you are using a flat paint for clear coat you would have to sand the defect away and then re-apply the final coat.