Wing covering with fiberglass : total fiasco

Tried to cover a wing with fiberglass over last night, and it was a total fiasco. The fiberglass didn't stick to the ps at all. This was with the method whereby you put the resin on the fiber on a sheet of mylar, and then press that on top of the wing. This is supposed to keep the amount of resin to a minimum, to keep the whole thing light, and to give a mirror finish. I will try putting the resin on the fiber laid directly on the wing, next. No mirror finish, but it should stick, at least. Location : Beauvais, France