I'm ,(for the most part)a kit builder but I've assembled
several ARF's for myself and others.

I've never,nor ever seen anyone pull back the covering
to glass the wing joint. There might be several reasons
for this but I suspect for the most part it because :

1. it's not needed
or
2. it's too much like work which is why an ARF was
purchased in the first place.


Regards
Roby