Originally Posted by
Matt Gonitzke
I am not aware of any STC that lets you put Imron over fabric, and that paint is likely part of your problem. It gets very hard and brittle after some years, which is not a problem on a car body because it doesn't flex very much in comparison, but on fabric, this will cause it to crack. To repair it legally, you have to uses all products from an approved process, i.e. Poly-Fiber, Randolph, Stewart Systems, etc. That won't make your entire paint job legal though. I bet your mechanic doesn't even know it was painted with Imron unless he went 20 years back into the logs the first time he did your annual. At the end of the day, you have to make him happy.
If I remember correctly, the Stewart Systems process can be used to repair any other process; I am not sure if that is also true with the others.