Ha! I had the same question, I have a Pt-20 and I didn't know whether you cover over it or not (I didn't forget to put it on). It looks rather bulky... Are you supposed to sand it?

I've asked my father a lot of questions while building my plane because he used to be in the hobby when I was first born, he never finished building his second plane and he didn't use that fiberglass cloth thing that came with my kit... so... he couldn't help me there...