Since your GT350 is a 2019, Ford should replace the hood.It's not rust it's "corrosion" since the hood is aluminum. Bought a 8k Mile gt350 last October and noticed it a couple days after it bought it. I'm was sick to my stomach. Brought it to my dealer and waiting on ford now for their response . The car is parked during the winter and now it's starting in two other spots several inches away from the e original spot
The Paint and Corrosion Warranty after 2015 was revised. Aluminum panels do not need to be perforated for warranty claims and proper action per Ford is to replace the entire panel, not attempt to repair it.
The Paint and Corrosion Warranty is also outlined in all S550 Owners Manuals.