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thats NOTHING lol
Compared to my sun roof yours is mint rofl
on rust like that, use wire wire wheel if you can (its the fastest but can be destructive), a wire brush delicate touch, try to scrape out the rust, cut it out, pull it out, wire it away. Remove it completely if you can.
Any rust leftover, treat with something, I favor POR-15 but any kind of rust convert/inhibit etc... paintable surface or hard candy coating
Something like POR-15 you can put on all the nearby metal surfaces to keep them from every rusting again. Just be sure to follow the directions and use the proper preparation for the surfaces.
then paint it whenever
To keep that from happening leave a small (1/4" or so) gap in the sunroof cover so water vapor can escape into the car. By leaving the sunroof cover closed fully, water is trapped in that space and if there is sunlight it also gains energy(velocity, kinetic energy). Water can enter the sunroof through several areas and get into that space naturally by design; this was not the flaw. The flaw is that it has nowhere to go once it enters that space between the cover and opening. In other words, it functions like a trap for water vapor. Large mass of water can flow into and be exposed into that space and it has a partial pressure which allows many water molecules to evaporate into that space, where they simply bounce around with elastic collisions as gas molecules are want to do. If you imagine that space filling with bouncing balls, try to imagine how easy it would be for them to actually hit the exact tiny opening in the sunroof superior (top) portion in order to escape. Try to imagine how hard it would be to aim one of those water molecules at the opening from which they came in. So, many will enter, few will leave. Instead of leaving, they eventually hit a surface and stay there (absorb into the cloth or precipitate onto the metal surfaces). As the day and temperature changes they go back and forth from liquid to gas, always attaching or attacking surfaces.
Water can be a very destructive force depending on the scenario
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