You can use Pro Polish after if you'd like. What is your LSP going to be? If you're using a PB's sealant, you really dont need to. If you're using something a little less tolerant of the surface it's going on, you could use your pro polish or just wash the car again to rid it of the polishing oils.
Is that your dobe in your avatar. I love those dogs. My family had one when I was just a little guy, and I'd like to have another some day.