Ed has successfully repainted a crinkle top. The reason that a spot came off, is because it wasn't properly prepared prior to the original painting. The roof can be sanded down to bare metal, and a smooth finish can be applied. As with all body work, it is only as good as the person doing the work. If they are conscientious at doing a good job, then the work will last a very long time. If they are sloppy, then it will not. One of my cars is in the body shop having the top repainted. I stopped in today to check on it, since it was in the paint booth on Friday being painted. Today, they had most of it covered with plastic, and were repainting the top of the rear door. I asked why, and the shop owner said that he wasn't satisfied with the way that it looked when he brought the car out into the daylight. He cares about the quality of the work that leaves his shop.