Auto body repair & detailing: Rust hole wing mercedes E-Class, rust hole, mercedes e class

Question
Can you tell me the easiest method to fill a rust hole about 3" diameter in the wing of my mercedes.
Thanks

Answer
two options: 1: Cut a small piece of metal that is slightly larger than the hole after you have cut out all the rust and weld it in. After welding in, grind welds and use body filler to fix imperfections. 2: U can use fiberglass cloth and repair with 3 or 4 layers for gap the rust hole. Not as good as welding, but it will work.