Hello, my Z4 (E85) has set rust at the door. Of course at the fold, where you can repair particularly badly. Above the fold is attached a sausage made of sealing compound. My plan is now to cut away the sealing mass in the affected area and then remove the rust mechanically. Then comes the following: grating with Nigrin rust remover gel primer with Brantho corrux “nitro-resistant” varnishing with original BMW varnish from the can (colour + clear varnish) is on the inside, there is hardly a sausage from sealing compound to be applied anyway Spray the door from the inside with Owatrol (through the drain holes in the door) After a few days spray the door from the inside with fluid film (through the drain holes in the door) What do you think about it? Would you do something different? If yes, why? Thank you for your help!