Hello together, I tried to use tutorials to make sense, now I would have liked to discuss the opinion here with you… It is generally about underbody protection for cars. I have now come up with the following solutions: Solution with “Owatrol oil” Remove rust, while taking care that the rust is not removed too aggressively with heat development. The rust must not seal itself by frictional heat. Several layers “Owatrol oil” brush or spray. Solution with “Rostumwa ndler & Fett, Brunox Rostumwandler und Ropefett was used here. Remove rust, apply the rust converter, let it dry, spray over with grease. Are there any other options? Do you have to consider whether it is a road or offroad vehicle? Grade the sealing and the protective layer e.g. with rope grease, are there any other preservatives? MfG Elektroman99