Digital BW, The Print

First of all, maybe I make a mistake but I dont find the "archive
search" to be of any help, I never seem to find that much.
i.e. When I type in "Hahnemuhle photorag" or "photorag" simply, there
are hardly any postings displayed, however I think I remember having
read quite a bit of postings about that topic.

So, I just started to explore that paper - the light version (180g?)
and the 308g version: 

1. I read in several places that one has to brush the surface in order
to avoid flaking or however this is called - I had nozzle problems
when printing without doing anything on the surface. What brush to
use? How strong/ soft?

2. How to protect the surface after printing? The prints seem to be
extremely sensitive to scratches. Can I apply premier art shield?

If someone can direct me to a place where this is covered, this is
fine of course.

Thanks in advance,

Bernhard