Well Michael, you said that in your experience the reflective material tends to just flake off. That certainly isn't my experience. Maybe what you are looking at is based on a different substrate from what I'm using. I don't know. What I'm using is a plastic poly type substrate and the silvery material is stuck on very securely. I don't see much of an issue there with it flaking off.
Also, you said that you didn't think that it would reflect radiation because one side of it is in contact with a surface of some kind, be it the substrate itself or something else. That isn't the way it works. Only one side needs to have an airgap. The other side can be in direct conductive proximity to any material. That is the physics of a reflective material - it does not conduct light or heat from one side to the other, but instead reflects it back.
Sorry to be so late with this.
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