Yes, No, Maybe
If the aircraft is on a permit, its up to the kit manufactures and the person who supervises your/the work.
If its a real aircraft from a factory, its up to the factory and the work must be complicated/ supervised by a licensed engineer with a B licence for composites.
Anyway what I think your asking is a more general question, it can be fixed, it is wonderful stuff and not as complicated as you think.
JL..................