After 66,000 miles, I moved my Marsee tankbag from my black R1150R to my black R1200R, and rode the new R for 300 miles. I removed the tankbag and it had marred the R1200R's paint. Wax/polish and elbow grease removed the marks, but it still surprised me. I called the body shop that does repairs and paint for the BMW shop (and high-end Euro cars including BMWs); the owner rides new and restored Beemers. I asked if the new BMW paint was somehow softer, water-based, etc., but he was as surprised as I am. He suggested I ask around to see if anyone else is having the problem before I put another clearcoat on the tank.
Has anyone noticed anything like this? With black or any other color?
Meanwhile, the Marsee tankbag was washed thoroughly and is hanging out to dry. I'd buy a new one, but the BMW bag is too tall for my tastes, and low tankbags (i.e., four inches high or so) with large map windows seem to be out of style in the aftermarket, too.