In this particular case, I am processing the parts for an operator under an FAA approval and not the OEMs approval. The OEM has, and excercises, its right to withold data such as this. The operator relies on the repair station, with the help of OEM manuals, to process the part correctly, so ultimately has very little input to the processing of the parts. When no OEM data is available, I have to generate my own substantiation in many cases. As an FAA engineering representative I can actually approve the data. However, not being a shot peening GURU, I have to rely on other experts to guide me in the right direction. I just can not believe that this is not published data. If glass peening of inconel is a standard industry practice, then someone has surely published the parameters and properties of the process.