I have two Avistars, one with the ply wing joiner and one with the metal rods. I glassed both of the airplanes wings. I glassed the tops and the bottoms, if you are careful with a little heat you can peel the covering film out of the way. Peel it back about two inches either side of the centerline, glass, sand and reaply the covering, you have to look hard to see the glass job.