RE: wing repair how?
The covering is like a contact paper made with plastic. You can patch the area with a low heat covering film such as Ultracote. Monokote requires too much heat to easily do the job.
A quick fix is colored packing tape. The tape we call Zagi tape(packing tape) will work fine. The tape can be shrunk with a heat gun. If you use a heat gun, be careful that you don't melt the factory covering. As mentioned in another post, clear packing tape will work and you'll be back flying in no time.
Before you apply the tape, clean the surrounding area of the damage with denatured alcohol.