Here are a few photos showing wet sanding and buffing.

Some 2000 grit wet and dry sandpaper was used. This is primarily to remove the dust on the surface.

After the model is wet sanded then buff it out with some white polishing compound and 6" electric buffer.

This leaves the finish a uniform satin. I usually stop here as the satin finish hides minor imperfections.

If you want the highly polished look then continue the polishing with a liquid car polish.