Hello together, I finally bought an E91 Bj 2010. Was yesterday under the car and could find a few rust approaches, preferably at the rear or tub of the trunk. The look that the rust is there I find not bad, because it is also an already 11 year old car, however I want to drive with it and want to treat the rust so that the sheet does not go through in the worst case. Now my question how do I treat the places best? – With rust turnaround r brushing and is good? – Make rust away before with the risk also to remove coating around and then with rust converter? – Just underbody protection on it? which is the better bitumen-based or wax? Thanks for every advice. Greetings