Jon, definately glass the center....Im suffering from a slight delima right now, my Sledge is suffering from split wings slightly at the center. Paul told me to glass my center section but I didnt. I am no longer a fan of asphalt runways...it seems a few too many dead sticks from 5' over the runway has done a little damage. But you also MUST have clean (uncovered) fuse to adhere to with the epoxy when joining the wing to the fuse. Dont ask me how I know that either....[:@]