Detailed the exterior again yesterday with Koch Chemie Hydro Foam Sealant - I love this stuff. As you can see, it is so hydrophobic (from previous applications) that the spray foam barely sticks to the car on this application. I didn't know about Koch Chemie before I bought the car at the Alpharetta Mercedes dealer. Koch Chemie is the product the dealership uses on all their cars. I thought that was endorsement enough for me to give it a try.
