Exterior Window Covering

[Lin]

My 5a does not have any windows skinned.  Instead there were boards cut to size, fit to each window in two sets of sliders.  They were painted black, but need to be redone.  A neighbor of mine can make custom prints on vinyl, so we are planning to run a panoramic landscape across the windows.  It will be interrupted in places, but I still think it will be good.  I have taken down the old boards and two of the windows have cracks.  So, instead of sticking the vinyl directly on the windows, I am thinking of sticking the vinyl to the boards, which I seem to be thin fiberglass panels.  I then would glue the panels back over the windows.  What would be a good adhesive to use to mount the panels on the window glass?

Modification:  Is there any material I can use to replace the panels that would have some insulation value?