Rust on the Fox ?

Hello dear Fox friends. During the spring cleaning I noticed my 3 years old Fox first rust base, at least I believe it looks like it. If you open the trunk and then the pressure pistons for the lid are attached to the C-pillar to the left and right. Follow the C columns to the top the corners where the columns and the roof converge. These connections are like the edges on the doors etc. first covered with some putty and then overpainted. At the places I have approx. 0.5 cm long cracks in the paint exactly in the area of the kitt. So on to the friendly which meant only quite cool that is not bad because the kitt is elastic and then the paint can tear by movement in the car. At my Ford Focus I also had these cracks after six years and a few months later masive rust under the kitt, which was therefore not seen. After about two years I then had a wet sky inside in rain – diagnosis: rusted through! Now i What do you think about it? Do your foxes have cracks at the places? What about the fox and rust at all, does anyone have experiences? Hanjo