The only fiberglassing I ever do is to join 2 wing halves, i never use dihedral braces. I lay the fiberglalss cloth over the wing halves that have been CA glued together. I cut the cloth long enough so it will encircle the whole wing meeting at the traling edges. i dont wrap it over the trailing edges, just to the edge. Then i pour on 30 minute epoxy and smear it out a little, then hit it with my heat gun, it thins out like water and will really saturate the cloth. I use a scrap piece of balsa to smooth it out. let dry overnite and it will be easy to sand smooth.