I have a design which uses a secret technique, and I would like it to remain secret, at least for a period of time. My plan was to pot the board in epoxy. Specifically, MG Chemicals 832TC is advertised as providing "superior protection from ..., and analysis".
But then I read on PottingSolutions.com that epoxys can shear off SMD parts due to thermal expansion or contraction, especially below the glass transition temperature. It seems that the very properties that make epoxy hard to remove are those which are incompatible with fragile SMD parts.
What is the recommended way to protect trade secrets on boards with SMD parts? I was considering applying a thin coat of silicone and then filling the rest with epoxy. If it matters, this will be inside of an aluminum box.