the inside is fine from what a can see its the outside that is just starting to bubble, think its the actual sunroof carrier that has rusted but havnt taken it out yet cause want to keep it as dry as possible, see a dont know many welders up these ends and he sounded like he didnt even want to try sort the roof.

ive seen your thread before very nice motor how much your carbon fibre roof cost? and how does it attach?