Hello,
I saw some hybrid circuits drowned into a black, very hard substance,
I guess to hide their "secrets".

Now I need to do something similar.. I have to borrow some circuits to
a customer, but I don't want him to reverse engineer them. Not only I'm
gonna cancel signs/labels from the ICs, but I also (for some added
security) I would like to drown most of it into this black, very hard,
substance. I guess that if he tries to remove it, the circuit board will
be damaged. The circuits will return to me, so I'll know if he tried to
be too smart.

Could anybody give me some pointers / directions, please? For a good
start, I would need to know the name of this substance (to then try to
translate it into my own country language).

Thanks!
Andrea

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