Some have found that the nuts and bolts that secure them to the running boards start to corrode beneath the rubber. First clue that it is happening is when you see little pregnant bumps appearing along the rubber. As advocated by Dave W, it is better to secure them with a non metallic/plastic fixing. If you ignore it, there is the risk that the corrosion will spread into the paintwork itself and start creeping out under the strips.
Although I haven’t experienced these issues in 8 years of Morgan ownership, if I had my time over, I would not specify tread rubbers. They are a nuisance for trapping water when cleaning the car and another trap for polish residue along the edges.
