Not corrosion , its just the way the pic is , The only corrosion so far has been the ADF antenna was trashed , and the Dzus fasteners are rusty , Every plane is a different story , one thing for sure is that sitting is not good for any machine , There are mitigating factors sometimes....One is price , one is where they sit , ..... So far I have only put 900 dollars into the project , ( new tailpipe , used glareshield , used battery , used pucks , 70 gals fuel , new lenses for a few of the radios ) I don't go into these things with my eyes closed , You will hear the (experts) rip it apart , I love when the experts chime in and give their opinions , I have bought and sold many aircraft and over the years only one had a cam issue , The best part about this project is that it came off a property that had 40 cats on it , there is NO rodent or bird damage at all...took me a while to put the two together , also sat in an area that got direct sunlight , Anyhow , The engine purrs like a kitten , (had to clean the points to get it started ) and the autopilot and F/D ground check , So far the only squawks are the lighting in the dash , and the Monroy traffic detector wont turn on , I'm pretty confident this will make a nice bird and I cant wait to fly it....Haven't flown a J in 20 years ..