Have you ever gone some where and you get the feeling some on has been there before, you get that a lot when fixing old airplanes even ones with new paint. I alway try to do my repair so it looks like the factory, it is like reading a book. Thins is a Cessna 170B wing, 3 degrees of wash out that has wing some damage history, looks like the last repair was for a little more damage that I have to repair. The trick is how much to replace.