One important aspect of fabric covering is the weight issue. The exact final weight with "fabric" has been quite controversial for a good while now. Some report huge weight gains (as much as 15lbs) while others report only a modest gain (Coatings&Paint) with their particular covering. A little later (when I get the chance) I'll weigh an aileron covered in 1.7oz Poly-fiber (sealed with Poly Brush, UV coated with Poly-Spray, and painted with Auto paint) and see how it stacks up against a plain old Tedlar covered aileron. Should be interesting.
Anyone with a fabric covered plane please feel free to chime with your opinion on total weight added or anything else you care to share.
Shannon