Yeah, I have read about printing a scale flag and using this. I have never tried any of the methods, but perhaps some day. That certainly would the the most efficient method for a historical flag.
Baron - It was indeed the MMSI meeting. It wasn't during Art's flag presentation, but during the show-and-tell of member projects. I think it was one of the club officers who was giving the description of this magic material. I'm terrible with names, but this was the first time I actually "went" to a meeting as I am a member from afar. They had recording of the meeting but it was turned off before this part.
Perhaps this is all a figment of my imagination too, but it seemed pretty descriptive. I'll just pose the question in the chat of the February meeting if nobody knows what this mystery material could be.