The black paint is flaking off the metal plates over which the film passes in my new-to-me Mamiya Six folder. I fear that the film might be scratched. The flaking is right on the area where the film passes over. I don't see evidence of scratching in my test roll... but the paint is coming off quite steadily. Suggestions for what to paint on there? Whatever was on there looks to be a thin black enamel. I was thinking about black nail polish... anybody got better ideas?